Article

Was Krashen right? Forty years later

Abstract

In the late 1970s and early 1980s, Stephen Krashen developed Monitor Theory—a group of hypotheses explaining second language acquisition with implications for language teaching. As the L2 scholarly community began considering what requirements theories should meet, Monitor Theory was widely criticized and dismissed, along with its teaching implications. What happened to these ideas? We argue that many of them have evolved and are still driving SLA research today— often unacknowledged and under new terminology. In this essay, we focus on three of Krashen's five fundamental hypotheses: The Acquisition‐Learning Distinction, The Natural Order Hypothesis, and The Input Hypothesis. We argue that these ideas persist today as the following constructs: implicit versus explicit learning, ordered development, and a central role for communicatively embedded input in all theories of second language acquisition. We conclude with implications for language teaching, including a focus on comprehensible input and communication in the classroom.
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Was Krashen right? Forty years later
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DOI: 10.1111/flan.12552
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Foreign Language Annals. 2021;123. wileyonlinelibrary.com/journal/flan © 2021 ACTFL
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1
Received: 28 August 2020
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Accepted: 7 May 2021
DOI: 10.1111/flan.12552
ORIGINAL ARTICLE
Was Krashen right? Forty years later
Karen Lichtman PhD
1
|Bill VanPatten PhD
2
The Challenge
Krashen's Monitor Theory first appeared some 40 years ago. Does it belong to the
history of language teaching? Or do Krashen's ideas still drive second language
acquisition researchunacknowledged and under different namesand thus still have
relevance for teaching? We argue that they have survived and are still relevant
1
Department of World Languages and
Cultures, Northern Illinois University,
DeKalb, Illinois, USA
2
Independent Scholar, Chowchilla,
California, USA
Correspondence
Bill VanPatten
Email: aliasbvp@gmail.com
Abstract
In the late 1970s and early 1980s, Stephen Krashen
developed Monitor Theorya group of hypotheses
explaining second language acquisition with implica-
tions for language teaching. As the L2 scholarly com-
munity began considering what requirements theories
should meet, Monitor Theory was widely criticized and
dismissed, along with its teaching implications. What
happened to these ideas? We argue that many of them
have evolved and are still driving SLA research today
often unacknowledged and under new terminology.
In this essay, we focus on three of Krashen's five fun-
damental hypotheses: The AcquisitionLearning Dis-
tinction, The Natural Order Hypothesis, and The Input
Hypothesis. We argue that these ideas persist today as
the following constructs: implicit versus explicit
learning, ordered development, and a central role for
communicatively embedded input in all theories of
second language acquisition. We conclude with im-
plications for language teaching, including a focus on
comprehensible input and communication in the
classroom.
KEYWORDS
Communicative Language Teaching, HighLeverage Teaching
Practices, Second Language Acquisition
In the late 1970s, Stephen Krashen began articulating a series of ideas about second language
(L2) acquisition
1
that were gathered together in what he called the Monitor Model (and later
Monitor Theory; see e.g., Krashen, 1982). Monitor Theory was widely criticized for not living
up to the requirements of a theory (e.g., not having explanatory adequacy; containing un-
operationalizable constructs; inadequate definitions). However, discussions about the adequacy
of Monitor Theory helped to launch a debate about what a theory of L2 acquisition should be
(i.e., Gregg, 1984; Jordan, 2004; Long, 1990; McLaughlin, 1987; among others). What emerged
was a proliferation of hypotheses, theories, and models all seeking to address L2 acquisition in
some way (for a variety of mainstream approaches; see VanPatten, Keating, & Wulff, 2020).
Many attempts at theory development owe their origins to Krashen's original and early attempt
to characterize L2 acquisition.
Despite this intellectual debt, the orthodoxy in most teacher education programs today is to
view Krashen's ideas as a set of historic eventsif they are reviewed at all (e.g., Shrum &
Glisan, 2010).
2
Replacing Krashen's focus on comprehensible input, a concern for proficiency
especially oral proficiencybecame central to language teaching in the United States
3
. As the
profession moved toward adopting measures such as the American Council on the Teaching of
Foreign Languages (ACTFL's) Oral Proficiency Interview and Performance Descriptors, the
roles of input, comprehension, and even the communicative classroom in acquisitionalong
with the research that supported such constructswere downplayed (e.g., Higgs & Clifford,
1982; Omaggio Hadley, 1986). Instead, the profession moved toward using guidelines and
standards to inform teaching practices. Krashen's ideas were seen as incompatible with the
push for getting learners to produce language and thus were deemed either irrelevant or simply
wrong.
A result of the rejection of Monitor Theory as an account of L2 acquisition was a rejection
by many languageteaching professionals of the implications of the theory for language in-
struction. Krashen, for example, argued that classrooms should be places where instructors
provide lots of comprehensible input in an encouraging environment. He also argued that a
focus on grammar did not lead to the acquisition of an unconscious linguistic system. Ac-
cordingly, a focus on grammar should be limited to those situations in which learners could
monitor (i.e., edit) their output. These situations would include prepared speeches and
written compositions, for example, but not spontaneous speech (see Krashen, 1982, chapters 3
and 4).
Although Monitor Theory is no longer regarded among scholars as an adequate theory to
account for L2 acquisition, there is a nagging question in language teaching as to whether the
1
We follow recent convention in scholarship and use L2 acquisitionto refer to the process of acquisition and the acronym SLAto refer to the field of
research concerned with that process.
2
We note for the record that comprehensionbased language teaching did not originate with Krashen. In the 1960s and 1970s, there were proponents of
programs that pushed for the very ideas that Krashen would articulate later (e.g., Valeri Postovsky, Harris Winitz, James Asher, Leonard Newmark). In fact,
comprehensionbased ideas for language acquisition have been around for much longer (for some discussion, see Musumeci, 1997).
3
We are exclusively focused on what has transpired within the context of the United States, without reference to the teaching of English or other languages
outside of this country.
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LICHTMAN AND VANPATTEN
baby was thrown out with the bathwater. It may be appropriate to question the adequacy of
Monitor Theory as having the explanatory capability in SLA for observable phenomena (e.g.,
Long, 1990; VanPatten, Keating, & Wulff, 2020), but we might also question whether some of
Krashen's central ideas were, in essence, correct. What happened to these ideas once the theory
fell out of favor? What does the field of L2 theory and research have to say about these ideas
now? The intent of this paper is to review three central aspects of Krashen's theory to see where
we are today on the claims embedded in them. Those aspects of the theory are:
the acquisition/learning distinction,
the natural order hypothesis,
the input hypothesis.
Our position is that, in one way or another, these ideas have survived. They may be
discussed under different guises, but they have not vanished. That they have not completely
disappeared leads us to question some of the prevailing beliefs in language teaching today; that
is, once again, we question whether the baby was thrown out with the bathwater. We will begin
with the acquisition/learning distinction.
1|THE ACQUISITION/LEARNING DISTINCTION
1.1 |The original claim
The acquisition/learning distinction is the cornerstone of Monitor Theory. In his 1982 book,
Krashen described acquisition and learning as two distinct and independent ways of devel-
oping competence in a second language(p. 10). Acquisition was defined as follows:
“…language acquisition [is] a process similar, if not identical, to the way children develop
ability in their first language. Language acquisition is a subconscious processThe result of
language acquisition, acquired competence, is also subconscious(1982, p. 10).
In contrast, language learning refers to conscious knowledge of a second language,
knowing the rules, being aware of them, and being able to talk about themSome synonyms
include formal knowledge of a language, or explicit learning(1982, p. 10).
In an endnote, Krashen notes that the acquisition/learning distinction predates his work:
The acquisitionlearning distinction is not new with meBialystock and Frohlich (1972)
distinguish implicitand explicitlearning, and Lawler and Selinker (1971) discuss mechan-
isms that guide automaticperformance and mechanisms that guide puzzle and problem
solving performance’” (p. 50). Thus, a variety of scholars had proposed a similar distinction
between different learning mechanisms, including the most prevalent term today: Implicit
versus explicit learning.
1.1.1 |Modifying the claim
Despite its origins in the work of so many scholars, the acquisition/learning distinction came
under criticism early on. One criticism focused on the operationalization of learningand
acquisition.Gregg (1984) objected to definitions of acquisitionas a process leading to
competence, whereas learningis a state (of being able to verbalize rules). Many noted that it
LICHTMAN AND VANPATTEN
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3
is difficult to identify particular bits of language knowledge as acquired versus learned (Gregg,
1984; McLaughlin, 1978). McLaughlin (1978) objected that it is impossible to know whether
subjects are actually operating on the basis of ruleor feel’” (p. 317). Critics reflected on their
own languagelearning experiences, identifying language rulesthat they were taught ex-
plicitly but about which they were nonetheless able to develop intuitions. Newer research has
tackled this issue and made considerable progress in identifying whether implicit or explicit
knowledge is accessed in given tasks. Ellis (2005) showed that some tests (e.g., untimed
grammaticality judgments) tap explicit knowledge, whereas others (e.g., oral narration) tap
implicit knowledge. Factors distinguishing these types of tasks included time pressure versus
unlimited time and focus on meaning versus form. Rebuschat (2013) added additional methods
of verifying whether participants are using explicit knowledge: Retrospective verbal reports,
direct versus indirect tests (i.e., a test where participants are directed to use explicit knowledge
compared to one where they are not) and subjective measures such as confidence ratings.
Another criticism centered around what was later called the noninterface position, or as
Krashen (1982) articulated it, the idea that Learning Does Not Become Acquisition.Speci-
fically, Krashen argued that consciously taught and learned rules are not later internalizedin
a way that makes them part of the learner's complex, abstract implicit language system. In-
stead, they become part of the Monitor, usable only for editing output. Krashen acknowledged
that this idea conflicts with the widespread cognitivecodeor skillbuildingviewthat
learners first consciously learn a rule, and later acquire or internalize it through practice
(DeKeyser, 2007; Gregg, 1984; Spolsky, 1985). Introspection was again used to counter Kra-
shen's claims here. For example, Gregg (1984) claimed that he had memorized Japanese
grammar paradigms explicitly, which he was then able to acquire instantaneously,with very
little input (p. 81). Gregg was willing to accept Krashen's claim that learning does not always
become acquisition, but demanded more evidence for the proposition that it cannot become
acquisitiona point we will return to a bit later in this section.
A third criticism was the amount of evidence presented in favor of the acquisition/learning
distinction (McLaughlin, 1978; Spolsky, 1985). It is true that many of Krashen's papers focus on
case studies of successful language learners, not on large, controlled studiesand, that he is
often content with corroborating evidence rather than causal evidence. For instance,
McLaughlin (1978) demanded that evidence be presented for the claim that consciously learned
information cannot be used to initiate utterances. Krashen (1979) countered that this idea is
consistent withvarious phenomena including morpheme orders, language aptitude, in-
dividual variation, and L1 influence. Gregg (1984) wanted evidence for Krashen's claim that
acquisition takes time and substantial input, as well as for the claim that conscious knowledge
cannot become unconscious and that unconscious knowledge cannot become conscious
(Spolsky, 1985).
Those working in linguistic theory were more sympathetic to Krashen's ideas.
Schwartz (1986) claimed that Krashen's theory is one of the few compatible with
Chomsky's theory of language learning as a special human faculty. It was also compatible
with the cognitive science of the time. She rejected the criticism that the inability to
determinewhetheraspecificpieceoflinguistic knowledge arose through learning or
through acquisition is problematic. Rather, since this distinction refers to abstract
properties of the mind, we should expect the evidence for or against it to be similarly
abstract and indirect. Schwartz presented a number of ways that Krashen's theory could
be falsified (countering claims that it is unfalsifiable). Some of these include whether
learners can correctly judge structures that they have never been taught and whether
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principles of Universal Grammar are violated in L2 acquisition. Both of these points,
among others, have been well researched within the generative traditionand, overall,
the research supports Krashen's position (e.g., Hawkins, 2019;White,2003, among many
others).
Schwartz (1993)andZobl(1995), citing new studies on the effects of giving learners
explicit positive and negative information, continued to defend Krashen's idea that only
comprehensible input can contribute to the growth of a learner's interlanguage system.
Schwartz (1993) argued that explicit information contributes to Learned Linguistic
Knowledge but not to the developing interlanguage system, which is more closely asso-
ciated with Universal Grammar. Zobl (1995) presented a number of studies that postdate
Krashen's theory but are consistent with its predictions for the results (or lack thereof) of
codefocused instruction.
Despite a number of linguists agreeing with Krashen's ideas, many practitioners
and pedagogues, along with some researchers, reacted negatively to the implications of
the acquisition/learning distinction for teaching. After all, the pedagogy of the timethe
cognitivecode approachrested on a grammatically based syllabus where learners were
presented with a grammatical rule, and then asked to practice and produce that rule.
The acquisition/learning distinction was rejected because it relegated this type of teaching
to playing a very minor role in language acquisition. And as is the case in much of
language teaching, many critics were working without with any particular theory of
language or of language acquisition (such as the ideas about interlanguage put forth in
Selinker, 1972).
While generative theorists continued to work in the background on the implicit nature of
competence, the field of psychology resurrected the acquisition/learning distinction under a
new name: Implicit versus explicit learning. Cognitive psychologist Reber (1967) began this line
of inquiry with experiments on artificial grammar learning. Participants learned sequences of
letters generated by a finitestate grammar (for instance, TPTS, VPXXVS) and were able to
judge whether new sequences were grammaticalwithout being able to articulate any rules.
Another contributor to work on implicit/explicit second language learning was Bialystok
(1979), who investigated task and learner factors contributing to the use of implicit versus
explicit knowledge.
While acquisition and learning are both processes, the terms implicit and explicit can refer
to the learning process, the resulting knowledge, or even the type of instruction the learners have
experienced (Ellis, 2009). Implicit versus explicit knowledge is probably the most studied of
these three constructs. Bialystok (1979) provided an early definition of implicit versus explicit
knowledge that is quite similar to Krashen's description of learning versus acquisition: Those
rules which can be consciously entertained by the learner are stored in explicit knowledge;
those rules which are honoured without attention to the rule or even an ability to state it are
stored in implicit knowledge’” (p. 82). Contemporary definitions continue to use the same
terminology of consciousness that Krashen used:
The term implicit learning was first used by Arthur Reber (1967) to describe a process
during which subjects acquire knowledge about a complex, rulegoverned stimulus environ-
ment without intending to and without becoming aware of the knowledge they have acquired.
In contrast, the term explicit learning refers to a process during which participants acquire
conscious (explicit) knowledge; this is generally associated with intentional learning condi-
tions, e.g., when participants are instructed to look for rules or patterns(Rebuschat, 2015,
p. xiii).
LICHTMAN AND VANPATTEN
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1.1.2 |Where are we today?
If we updated Krashen's acquisition/learning distinction to reflect current thinking, we might
say something like the following:
The complex and abstract mental representation of language is mainly built up
through implicit learning processes as learners attempt to comprehend messages
directed to them in the language. Explicit learning plays a more minor role in the
language acquisition process, contributing to metalinguistic knowledge rather than
mental representation of language.
Although implicit versus explicit learning is the leading term used by those studying what
Krashen would have called learning versus acquisition, it should be noted that there are other
similar constructs as well. Declarative versus procedural memory (Paradis, 1994; Ullman, 2001)
has been the basis for a variety of neurolinguistic experiments using explicit and/or implicit
training conditions by Kara MorganShort and colleagues. Controlled versus automatic pro-
cessing (recommended as a term all the way back by McLaughlin, 1978) is sometimes used.
Terms such as noticing (Schmidt, 1990) refer to the more explicit side of learning.When it
comes to instruction, the 1990s saw terms like Focus on Meaningreferring to (more) implicit
teaching, while Focus on Form/Focus on FormSreferred to different kinds of an explicit
focus on grammatical forms and structures (Long & Robinson, 1998).
As mentioned above, the terms implicit and explicit can be applied to learning,knowledge,
or instruction. Implicit versus explicit learning is the true construct of interest for many re-
searchers, but it is impossible to directly access or measure learning processes. Protocols such
as thinkaloud and retrospective verbal reports have attempted to do this, but imperfectly (e.g.,
Rebuschat et al., 2015). This leaves us with the options of manipulating the implicit versus
explicit instruction that is given to the learners or measuring the resulting implicit versus
explicit knowledge (or both). Just manipulating instruction is still problematic, as adult lear-
ners (particularly those with prior foreign language study) have an inconvenient tendency to
use explicit learning strategies and develop explicit knowledge even when placed in implicit
conditions (or, conversely, participants can ignore explicit information). Thus, measuring im-
plicit versus explicit knowledge is the most developed research strategy.
Ellis (2005) was the first major study demonstrating task characteristics that could be used
to separately tap implicit versus explicit knowledge. Tasks tapping implicit knowledge are
meaningfocused, timepressured, do not require the use of metalinguistic knowledge, en-
courage the use of feelrather than rules, and are often oral. The opposite characteristics
(formfocused, not timepressured, and so on) create tasks tapping explicit knowledge. More
recent work by Suzuki (2017) has refined this by identifying tasks that permit the use of
speededup or automatized explicit knowledge, versus those that are said to access only implicit
knowledge. The most implicit tasks include comprehension measures such as visualworld
tasks, wordmonitoring tasks, and selfpaced reading tasks (e.g., Foote, 2011; Granena, 2013;
Suzuki, 2017; Tanenhaus & Trueswell, 2006).
Another current issue is that of explicit versus implicit teaching.It should be noted, first,
that this specifically refers to the teaching of grammarany classroom setting involves the
explicit idea that learners are supposed to be learning something. Housen and Pierrard (2006,
p. 10) describe implicit instruction as being delivered spontaneously in an otherwise
communicationoriented activity, unobtrusive (minimal interruption of communication of
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meaning occurs), presenting target forms in context, making no use of metalanguage, and
encouraging the free use of the target form. Explicit instruction, on the other hand, is planned
as the main focus and goal of teaching activity, is obtrusive, presents target forms in isolation,
uses metalinguistic terminology (e.g., rule explanation), and involves the controlled practice of
the target form. Note that both of these include the idea that there is a target formthat is the
real goal of learning. This is also true of research studies on implicit versus explicit instruction
conditions, which target forms such as gender agreement, case marking, transitive/intransitive
verb pairs, and others that could easily appear in the table of contents of a grammardriven
textbook. Thus, even research focusing on implicit learning often assumes that the goal is the
same old thingas that of explicit teaching: Grammatical accuracy in production. And this
complicates the research because it is entirely possible that learners assume that the teachers
are trying to teach something, thus engaging explicit processes.
This conceptthe idea that language learning is the internalization of grammatical rules
and formsis a barrier to truly implicit teaching and research. A newer perspective is that the
type of knowledge that learners build while creating a linguistic system is too abstract and
complex to be described using rules (VanPatten & Rothman, 2014; VanPatten, 2017,2019).
In other words, learners are building underlying abstract and complex morphosyntactic re-
presentations as described by theoretical linguistsquite unlike the rules that are found in
grammar textbooks. Even Reber (1993) emphasized that the product of implicit learning is
abstract in nature, and not at all related to the rulesused to generate his strings of letters.
In addition, nongenerative approaches such as usagebased approaches concur that what winds
up in the learner's head is not what teachers and many researchers think (e.g., Ellis & Wulff,
2015). Indeed, psychologists are converging on the idea that most of language acquisition is
implicit. Much of our language use takes place under severe time pressure: Having a con-
versation requires fast processing of the other interlocutor's utterances and fast formulation of
one's own utterances, in a situation where meaning is more important than perfect accuracy
in fact, nearly the exact conditions proposed by Ellis (2005) to create tasks that tap implicit
knowledge. For this reason, Ellis (2011) concluded that, although some questions about im-
plicit and explicit learning are still under investigation, there has been a growing consensus
over the last twenty or thirty years that the vast majority of our linguistic processing is un-
conscious, its operations tuned by the products of our implicit learning(p. 39).
Finally, there has been growing consensus that, just as Krashen claimed learning cannot
turn into acquisition, explicit knowledge cannot turn into implicit knowledge (e.g., Rebuschat,
2015; VanPatten, 2016; VanPatten & Smith, forthcoming). Whether one pulls from a theoretical
linguistic perspective, a usagebased perspective, a neurolinguistic perspective, or some other,
no theory has been able to postulate a mechanism internal to the learner that converts
explicit knowledge into implicit knowledge, echoing Schwartz's claim back in the early 1990s
(Schwartz, 1993). They remain separate knowledge systems (the noninterface position, e.g.,
Rebuschat, 2015). Explicit knowledge develops one way and implicit knowledge develops an-
other way. What is more, they are also viewed as qualitatively different, meaning that the
content of explicit knowledge and the content of implicit knowledge do not overlap. This is one
of the reasons various theories have posited no mechanism that can convert explicit knowledge
to implicit knowledge. The issue of whether explicit knowledge can influence the development
of implicit knowledge and just how it might do that is another matter and is beyond the scope
of the present paper (but see VanPatten and Smith (forthcoming), as well as Abugaber
(forthcoming), for some discussion).
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2|THE NATURAL ORDER HYPOTHESIS
2.1 |The original claim
At the time of Krashen's initial thinking about L2 acquisition, morpheme orders constituted a
major area of investigation. In the 1960s, Roger Brown had established that children learning
English as an L1 showed largely invariant order over time in their masteryof a set of bound
and unbound morphemes in English (Brown, 1973). These morphemes included such things as
noun inflections (e.g., possessive marking, plural marking), verb inflections (e.g., progressive
and tense markers), articles, copular (linking) verbs, and others. Inspired by this study, early L2
researchers began to examine morpheme orders in children and adults learning English (e.g.,
Bailey et al., 1974; Dulay & Burt, 1974; Krashen et al., 1977; LarsenFreeman, 1975; among
many others).
Based on this line of research, by the end of the 1970s, Krashen had claimed there was a
natural orderin language acquisition. To quote from his 1982 book: “…the acquisition of
grammatical structures proceeds in a predictable order. Acquirers of a given language tend to
acquire certain grammatical structures early, and others later(Krashen, 1982, p. 12).
2.1.1 |Modifying the claim
To be sure, there was some criticism of the morpheme studiesas they began to appear. These
criticisms centered on concerns about the instruments used to gather data and how researchers
classified something as acquired(e.g., Porter, 1977; Rosansky, 1976). However, by the mid to
late 1980s, dozens of such studies were reported using a variety of methodologies, examining
the acquisition of English as an L2 by learners of various age groups and with many different
L1s. Criticisms began to fade and morpheme orders have become a fact in L2 acquisition and
are no longer disputed (e.g., Hawkins, 2019; Long, 1990). What is disputed is a theoretical
explanation for such orders; however, the issues in the theoretical realm are far beyond the
scope of the current paper. Our point is that Krashen was correct in asserting a natural order
hypothesis by the late 1970s. However, his approach to the orders needed some refinement.
Because Roger Brown had looked at a variety of bound and unbound morphemes, L2 re-
searchers did the same. As Krashen attempted to make sense out of some of the slight varia-
tions he saw in the L2 orders, he hit upon the idea that rather than ordering individual
morphemes, we could order groups of morphemes. That is, three morphemes might be grouped
together as early acquiredand acquired before others, but allowing for some variation as to
the exact order for those three morphemes among themselves (see Figure 1). Scholars such as
Andersen (1977) and VanPatten (1985), however, claimed that looking at morpheme orders this
way made no sense. Instead, morphemes should be sorted by the syntactic function they play.
So nounoriented morphemes should be compared to other nounoriented morphemes, verb
oriented morphemes should be compared to other verboriented morphemes, and so on. When
sorted out this way, it was shown that there were invariant and universal morpheme orders
according to syntactic function. So the natural order hypothesis was correct, but it needed
clarification, if not modification (see the summary, e.g., in LarsenFreeman & Long, 1991).
However, there is more to the story.
Krashen's focus was exclusively on morpheme order research. At about the same time,
another line of L2 research began appearinga line of research also influenced by L1
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acquisition studies. This research was concerned with what can be called developmental
sequencesor stages of acquisition for a particular structure.Bellugi (1967), for example,
examined how children acquired negation in English over time in three stages. As L2 research
began to take hold in the 1970s, scholars wondered whether children and adults with English
as an L2 also demonstrated developmental sequences in their acquisition, and how these
compared to what was being found for L1 learners. As the reader might guess (or might already
know), L2 researchers did find such sequences. Developmental sequences for negation and
question formation were found for L2 English by researchers such as Henning Wode, John
Schumann, Roar Ravem, and a number of others. So, for example, child L1, child L2 and non
child L2 learners of English were all found to create similar stages of development for negation.
Those stages looked like this:
Stage 1: Negator + word/phrase: No like this one, no paper.
Stage 2: Subject + negator + verb phrase: I no like this one, He no see.
Stage 3: Negation with modals: I can't do this one, She won't go.
Stage 4: Negation with do: I don't like those, She doesn't live here.
Work on developmental sequences or stages continued well into the 1980s and expanded
into other structures and other languages: Most notably Spanish, French, and German using
both classroom and nonclassroom learners (e.g., Johnston, 1985; Pienemann, 1998; VanPatten,
1987,2010). Interestingly, developmental sequences (as well as morpheme orders) appeared to
be unaffected by instruction and feedback on grammatical structure (e.g., Ellis, 1989;
Lightbown, 1983; Pavesi, 1986; Pica, 1983) and they were found to be the same whether people
learned languages in or out of classrooms; that is, with and without instruction.
ING
PLURAL
COPULAR ‘be’
AUXILIARY ‘be’
ARTICLES (a, the)
IRREGULAR PAST
REGULAR PAST
3RD SINGULAR -s
POSSESSIVE ’s
FIGURE 1 Krashen's averageorder of acquisition of grammatical morphemes in English as an L2 (from
Krashen, 1982)
LICHTMAN AND VANPATTEN
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So what we see at this juncture is that Krashen's idea of the natural order hypothesis was
correct, but at the same time, was too narrow in scope. In fact, the research on L2 acquisition
was showing more ordered developmentthan we'd seen in the 1970s and early 1980s with
just morpheme studies. However, once again, there is more to the story.
We turn our attention to three other areas of inquiry. The first concerns what is called
Ushaped development. Under Ushaped development, both L1 and L2 learners demonstrate
the ability to correctly deploy certain grammatical properties of language only to lose this
ability and then regain it later. When graphed over time, the plot for accuracy resembles a U as
in Figure 2.
The classic studies on Ushaped behavior focus on past tense markings on verbsat least in
L1 acquisition (e.g., Ervin, 1964). In the early stages, learners correctly produce irregular past
tense verbs for those that are most frequent, such as ate and went. As regular verbs withed
endings begin to appear in their speech, learners seem to regularize the irregulars to create
nonnativelike forms such as eated/ated and goed/wented. As acquisition continues, the correct
irregular forms reassert themselves in learner speech. In L2 acquisition, Ushaped behavior has
been documented in a variety of domains, especially morphology (e.g., verbal inflections) and
lexicalsemantic development (e.g., Kellerman, 1983,1985; Lightbown, 1983)
At about the same time that we began to see research on morpheme orders, developmental
sequences, and Ushaped behavior, another line of research emerged. This was research on
markedness, especially typological markedness (e.g., Eckman, 1977,1985; Keenan & Comrie,
1977; VanPatten & Smith, 2019). Markedness in language can be difficult to define, but for the
purposes of this paper, we will talk about markedness in terms of prototypicality and under-
lying features. First, we delineate marked and unmarked (or more marked) aspects of language.
Unmarked aspects tend to be prototypical and more frequent, while marked elements are less
prototypical and less frequent. In a language like Spanish with a binary gender system, mas-
culine is considered to be unmarked while feminine is marked. Words with masculine gender
in Spanish are much more frequent than words with feminine gender. New and borrowed
words tend to be assigned masculine gender: el input, el feedback, el clic(k). And what we see in
acquisition is that masculine gender and agreement is acquired sooner than feminine gender
and agreement. We never see the opposite. The same thing is true for singular and plural.
Singular is considered unmarked while plural is considered marked. Singular forms are
0
10
20
30
40
50
60
70
80
90
100
Time 1 Time 2 Time 3 Time 4 Time 5 Time 6
FIGURE 2 Classic Ushaped behavior in language acquisition [Color figure can be viewed at
wileyonlinelibrary.com]
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LICHTMAN AND VANPATTEN
acquired before plural forms whether we're talking about nouns, adjective agreement, verb
forms, subjectverb agreement, or something else.
What happens with aspects of language that have multiple features? For example, verb
endings for person and number in Spanish are unique so that in most tenses, each
personnumber combination has its own verb form (e.g., the famous hablo, hablas, habla,
hablamos, habláis, hablan charts that Spanish teachers like to display in class). The data we
have on Spanish shows that learners acquire and use verbs with no features first (i.e., habla)
followed by singular forms (i.e., hablo, hablas) followed by plural forms (i.e., hablan, habláis,
hablamos). In short, when an element of language maps multiple features, it typically is later
acquired than forms that map no features or only one feature (e.g., Lardiere, 2007; McCarthy,
2006,2008). More features mean more marked. More marked means later acquired, in most
cases.
Before moving on, a word about data in research is important here. In workshops and talks
we have given, we sometimes come across teachers who say I've never seen those orders or
sequences in my students.And this may be true. However, the kind of language production
that teachers encourage from students is typically heavily monitored, focused on form, and
highly controlled. This kind of production does not form the data for the L2 research that is the
focus of this section. Instead, researchers use spontaneous and conversationaltype production
where the focus is on meaningor they use other instruments that do not rely on production,
such as grammaticality judgments and truthvalue tasks. More recently, researchers have
employed selfpaced reading, eyetracking, and other methods (see e.g., some of the com-
mentary articles in this collection). So teachers may not see what researchers see, which may
contribute to the rejection of ideas such as Krashen's in language teaching circles.
2.1.2 |Where are we today?
The case for something like a natural order hypothesis is actually stronger than it was back in
the 1970s and early 1980s. Krashen initially limited his hypothesis to morpheme order studies.
However, we have ventured far beyond a handful of morphemes to show that there is order
during acquisition, with predictable paths, stages, and so on in a variety of domains of lan-
guage. In fact, as VanPatten, Smith, and Benati. (2020) describe the current situation, it is more
accurate to couch all of these observations under a broader term called ordered development.
That is, learners acquire language in some ordered fashion and there is, to some degree,
universality involvedboth at the macro level and the micro level. We might, in a real sense,
replace Krashen's more narrow Natural Order Hypothesis with something like the Ordered
Development Hypothesis:
The evolution of the learner's linguistic system occurs in ordered and predictable
ways, and is largely impervious to outside influence such as instruction and explicit
practice.
Such a hypothesis would be accepted by most scholars in most theoretical camps, with the
exception of perhaps Sociocultural Theorywhich is largely a framework applicable to the
learning of explicit knowledge (e.g., language as subject matter) and not to the development of
a linguistic system (see e.g., the various chapters in VanPatten, Keating, & Wulff, 2020). The
stance of most scholars is that learners create a linguistic system based on data they are exposed
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to and that the evolution of this system is constrained by learnerinternal mechanisms coupled
with the kind of input data they are exposed to (see Section 3)although there is apparent
disagreement about what those mechanisms are (e.g., languagespecific mechanisms in the
generative framework and general learning mechanisms in the usagebased approaches). As
learners create such systems and as they evolve, we see ordered development in a variety of
ways in a variety of domains among a variety of learners and languages and in a variety of
contexts.
There is some universality in ordered development (i.e., all learners tend to do the same
thing over time regardless of context, L1, motivation, and other nonlinguistic factors), but the
research has also shown that there is some influence of the L1 and some individual variation.
However, both are constrained. L1 influence seems to be constrained in that even though all
learners create the same sequences and stages, learners with one L1 may linger longer in one
stage if it resembles their L1 in some way (e.g., Andersen, 1983). For example, learners of
Spanish may linger in Stage 2 of the acquisition of negation in English because it looks like
Spanish negation, whereas French speakers would not. Individual variation is also confined to
stages. Again, all learners seem to go through the same stages but in a given stage, some
learners may show preferences for a particular structure. In Stage 2 of English negation, for
example, some learners may exclusively use no as the negator. Some may prefer don't as an
unanalyzed chunk as in He don't like it. And some may switch back and forth. Yet, they adhere
to the structureof subject + negator + phrase. So there is universality across the develop-
mental sequences, with L1 influence and individual variation appearing within a given
stage (for a similar perspective, see Pienemann, 1998).
Along the same lines, the reader may recall that Andersen (1977) and VanPatten (1985)
argued for universality in morpheme orders according to syntactic function. Thus, all verb
related morphemes are acquired in the same order, all nounrelated morphemes are acquired
in the same order, and so on. However, Luk and Shirai (2009) argued that there is some L1
influence on such orders. They showed that with Japanese and Korean learners of English as an
L2, all verbrelated morphemes were acquired in the same order as in other studies, but there
was a slight deviation in the nounrelated order: In their account, possessive's is acquired
earlier than plural s. Assuming this to be true and not a fluke of the data they examined, we can
still argue for morpheme orders but with L1 influence. In other words, learners still go about
unconsciously acquiring morphemes in particular orders, but universality allows for some L1
influenceand note the use of some influence.As of this date, only Luk and Shirai have
offered any evidence of L1 influence on morpheme orders and only for Japanese and Korean
learners of English and only for one reduced area. Even then, not all of the learners exhibited
evidence of L1 influence.
4
One of the implications of Krashen's original hypothesis was that instruction did not affect
acquisition orders. Looking at the larger picture of ordered development, that implication is
still valid today. As of this writing, we are not aware of research demonstrating that instruction
alters ordered development. Earlier, we cited classic research indicating this outcome: Ellis
(1989), Lightbown (1983), Pavesi (1986), Pica (1983), Pienemann (1984), and Schumann (1978).
This research has stood the test of time. This is not to say that instruction has no effect on
4
It may also be the case that possessive's and plural sare two different kinds of morphemes that are related to nominals in quite different ways. In current
analyses, only plural sis a true nominal inflection (part of the NP) whereas the possessive is part of a determiner structure occupying a quite different spot in
the syntactic tree relative to plurals (see e.g., Radford, 2004). In this case, we are comparing apples to oranges, much as Andersen (1977) and VanPatten (1985)
argued.
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LICHTMAN AND VANPATTEN
acquisition in other ways. Our point is that it has no effect on ordered development and
seemingly little effect on the paths of developing implicit systems. Something internal to the
learner is in control of how language evolves over time.
3|THE INPUT HYPOTHESIS
3.1 |The original claim
Krashen introduced the input hypothesis saying that it may be the single most important
concept in second language acquisition theory today(1982, p. 9). He articulates the input
hypothesis in four parts:
(1) The input hypothesis relates to acquisition, not learning. (2) We acquire by under-
standing language that contains structure a bit beyond our current level of competence (i+ 1).
This is done with the help of context or extralinguistic information. (3) When communication
is successful, when the input is understood and there is enough of it, i+ 1 will be provided
automatically. (4) Production ability emerges. It is not taught directly(p. 2122).
Part 2 is the core of the input hypothesis, claiming that understanding comprehensible
input is the one and only way that learners acquire language. In other words, comprehensible
input is indispensible for L2 acquisition (e.g., Long, 1990; VanPatten, Keating, & Wulff, 2020).
Krashen uses ito represent the learner's current level of competence. How to characterize iwas
never really articulateda point which would draw much criticism towards the input hy-
pothesis. Did it refer to where learners were in terms of the acquisition of morphemes (i.e., the
natural order)? Did it refer to where they were in developmental sequences or Ushaped
behavior? Did it refer to something else? Similarly, i+1is meant to reference input that is
just beyond the learner's current level of competence. However, since iis not defined according
to any particular scale, i+ 1 is similarly undefined. The claim is that learners can progress by
understanding input that is at the i+ 1 level but not by understanding input that is too difficult
(i+ 5?) but we have no idea how to measure +1.
Krashen sidesteps this issue with part 3 of the input hypothesisrecommending that input
only be roughtuned,not finetuned, to the level of the learners. Advantages to this type of
nontargeted input are that learners may be at all different levels of proficiency; that nontargeted
input will provide reviewof many structures rather than an input flood focusing on one
structure, and that it allows communication to be more natural.
Finally, part 4 is a reiteration of the idea that comprehension, not production, advances
language proficiency. For this reason, Krashen recommends allowing beginning learners a
silent period,similar to the way children learning a second language often choose not to
speak for a few months at the beginning of their acquisition process. Allowing this silent period
reduces the pressure for learners to rely on the L1 to generate utterances for communication
when what they are being pushed to say is beyond their current L2 proficiency.
Although the idea of i+ 1 is unique to Krashen, the input hypothesis itself was not. The idea
that communicative, comprehensible input is necessary for language acquisition was present in
much empirical work from the 1970s. Studies on child L2 learning documented both the adults'
input and the child's output as part of a conversation. Children acquiring an L2 were shown to
produce the types of constructions that were most frequent in their input (WagnerGough &
Hatch, 1975). Native speakers were shown to modify their speech towards nonnatives in pre-
dictable waysshorter sentences, more repetition, and more comprehension checks (Hatch,
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13
1983). These modifications were a natural part of communication that increased the compre-
hensibility of the input and maximized interaction for the nonnative speaker (Long, 1981).
3.1.1 |Modifying the claim
Krashen's input hypothesis attracted considerable criticism. As with the acquisition/learning
distinction, many objected to the claim that comprehensible input was the only factor driving
the growth of language competence. Other factors that critics put forward as contributing to
language development included language practice, the learner's own output, the Monitor itself,
and of course, explicit grammar instruction (e.g., Gregg, 1984).
Most notably, the inability to operationalize i+ 1 in research made it an untestable con-
struct. Sometimes Krashen used this construct to refer to the next structure to be acquired;
other times, the next stage in the learner's development (Gregg, 1984). Spolsky (1985) pointed
out that Krashen did not define what exactly structureis in structure a bit beyond our
current level of confidenceand that this makes the i+ 1 hypothesis untestable. Some threw
the baby (communicative input) out with the bathwater (i+ 1).
Despite this criticism, a gradual shift occurred in most L2 theories and research in favor of
the fundamental role of communicatively embedded input in L2 development. Universal
Grammar, usagebased approaches, and the declarative/procedural model all hold implicit
learning processes and representations as primary (see e.g., the various chapters in VanPatten,
Keating, & Wulff, 2020, on these perspectives), thus placing input front and center as the data
sourcefor acquisition. Even theories that sound like they would contradict the Input
Hypothesissuch as the Output Hypothesis and the Noticing Hypothesisacknowledge the
fundamental role of input. In the case of the Output Hypothesis, the original claim was that
output facilitates second language learning sometimes, under some conditions(e.g., Swain &
Lapkin, 1995, p. 371). As for Noticing, the learner must notice items of interest in the input,
again underscoring the primacy of input in driving learning (e.g., Schmidt, 1990).
Interest in the role of input fueled interaction research by Michael Long and many others.
Interaction was never thought to be absolutely necessary for SLA, and its main role was (and
still is) to increase the comprehensibility of input (e.g., Long, 1981,1985). Paul Nation's work
on vocabulary size and the accessibility of reading can also be seen as an offshoot of com-
prehensibility research (e.g., Hu & Nation, 2000). Nation recommends that learners should
know 95%98% of the vocabulary in a text to benefit most from reading it. This could be seen as
an operationalization of the +1 in i+ 1: The +1 should be no more than 5% of vocabulary that
the learner doesn't know.
3.1.2 |Where are we today?
An updated version of the input hypothesis might be simpler than Krashen's version:
The principal data for the acquisition of language is found in the communicatively
embedded comprehensible input that learners receive. Comprehension precedes
production in the acquisition process.
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LICHTMAN AND VANPATTEN
Given that all
5
major linguistic, psycholinguistic, and cognitive theories about L2 acquisi-
tion posit a fundamental role for input, perhaps Krashen did not oversell the input hypothesis.
The observation that Exposure to input is necessary for SLAis characterized as just thatan
observation about SLA that all theories must explain. It is not a hypothesis (e.g., Long, 1990;
VanPatten, Keating, & Wulff, 2020). Generative linguistic theory sees input as triggering
languagespecific parameter settings as well as the instantiation of underlying principles.
Usagebased approaches require a large sample of language in order for learners to associatively
learn constructions. The declarative/procedural model emphasizes immersionlike input as the
route to L1like neurocognitive processing.
These theories differ on what they see as the useful data in the input, as well as what the
cognitive mechanisms are that make use of the input. For generative linguists, learners' in-
ternal mechanisms look for indications of abstract properties of the language being learned,
such as whether whelements move, whether overt subjects or null subjects are required,
whether there is verb movement, and how agreement works (if there is agreement). For usage
based approaches, for example, relevant data are found in frequencies of not just individual
items but also cooccurrences. The declarative/procedural model considers not just the amount
of input, but also the type of input (incidental/immersionlike vs. explicit/instructed) as in-
fluencing the resulting representations.
Most theories agree that what the learner gets out of the input is not rulesor structures
in the sense in which textbooks present grammar. Instead, mental representation is more
abstract and complex. One piece of evidence for this is that learners invariably know things
about language that they have never been taught or even exposed to (see e.g., VanPatten, 2019).
What is more, learners' mechanisms clearly cull input and filter it, which is why we see ordered
development as discussed in the previous section on natural orders.
Because of the rejection of the input hypothesis, many researchers did not focus on
comprehensible inputas fundamental to acquisition. That is, this particular construct fell out
of favor. More often than not, just inputhas been used, with the intention that it is somehow
comprehensible or that somehow learners make sense of the communicative intent of what
they are exposed to. VanPatten (2017) and VanPatten, Smith, and Benati (2020) use the term
communicatively embedded inputto underscore that learners are active interpreters of
meaning and are seeking comprehensibility. Primary linguistic datahas been used by some
generative theorists, and in input processing, one sometimes encounters data that learners are
exposed to.Usagebased researchers have used input dataand language data.On the other
hand, complexity theory has moved away from the idea of input because this term implies that
learners are passive recipients of input. The term affordances(opportunities for learning from
input) is preferred. When the input is present in the environment, the learner may actively
process that input if it is interesting or useful.
Despite the absence of the term comprehensible inputin contemporary research, it is still
in wide use among language teachers. From 1990 to the present, the Teaching Proficiency
through Reading and Storytelling (TPRS) community of language teachers has promoted both
Krashen's theory and the term comprehensible input.As the TPRS community grew and
branched out into new techniques for providing learners with comprehensible input, many
teachers started using the acronyms CI for comprehensible input and TCI (teaching with
comprehensible input) for the kind of teaching they were doing (e.g., Slavic, 2015).
5
Theories such as Skill Acquisition Theory (e.g., DeKeyser, 2007) and Sociocultural Theory are not theories about L2 acquisitionthey refer to general human
learning.
LICHTMAN AND VANPATTEN
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15
ACTFL, on the other hand, has not promoted the term comprehensible input,preferring
the terminology interpretive communication(National Standards in Foreign Language
Education Project, 1999present). On the other hand, the ongoing ACTFL project of carefully
describing proficiency levels could perhaps be seen as an echo of the idea of i+ 1. The Profi-
ciency Guidelines (first published as ACTFL Provisional Proficiency Guidelines, 1982) describe
a series of levels starting with novice (broken into sublevels low, mid, and high), intermediate
low, mid, and high, advanced low, mid, and high, and superior. Using Krashen's terminology, a
student's current proficiency level (e.g., novice mid) could be seen as i, and the next sublevel
(novice high) could be seen as i+ 1. This is not necessarily ACTFL's intention because the
proficiency guidelines are more focused on learner output (oral proficiency) than on input, but
the proficiency guidelines present yet another example of a very Krashenlike idea that is still
being actively discussed using different terminology.
4|IMPLICATIONS FOR LANGUAGE TEACHING
Given the update of Krashen's basic ideas as outlined above, the question that emerges is this:
What are the implications for language teaching? Are they different from what he offered when
he first launched the Monitor Model/Theory? As we see it, the implications are largely the same
with a few additions. We will outline those implications here.
Because language as mental representation is the result of a complex interaction between
communicatively embedded input and learnerinternal mechanisms, and because there seems
to be consensus that mental representation is the product of implicit processing and learning,
two implications are clear. First, learners need exposure to communicatively embedded input in
order for language to grow in their headsand as Krashen has stated, this input should be
comprehensible for it to be of use to the languagemaking mechanisms. In other words, lear-
ners should be actively engaged in trying to comprehend language and interpret meaning from
the outsetbut the language they are exposed to must be comprehensible to a large degree so
that it is not mere noise. There is no particular prescription for what makes language com-
prehensible, which is why we use the term communicatively embedded input. If the input
learners are exposed to is embedded in communicative events (e.g., conversation, storytelling),
they and their interlocutors will work toward mutual meaningmaking. For example, when
learners signal noncomprehension, interlocutors will adjust what they say as they negotiate
meaning with learners (e.g., Gass, 1997; Hatch, 1983). This negotiation generally results in
more comprehensible input (e.g., Long, 1985). Thus, comprehensible input is a natural by-
product of the attempt between learners and their interlocutors to effect communication. It is
no different in the classroom. As VanPatten (2017 and elsewhere) has stated, instructors should
talk with learners, not at them, and this is what makes input comprehensible in the long run.
So, instead of an instructor stringing five or six sentences together in a beginning classroom, the
instructor might engage learners in the content of meaningmaking all along the way. We can
compare in the following example.
Talking at: Okay, class. We're going to talk about what I did last night. First, I walked my
dog for about thirty minutes. Then I prepared dinner. After that, I watched the news. Later, I
called my sister, and finally, I read email.
Talking with: Okay, class. We're going to talk about what I did last night. Does everyone
know what last night means? [writes it on the board] Raise your hand if you don't know this
word. [several students raise their hands]. Okay, last night means____ [gives equivalent in the
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students' native language]. Everybody understand? Sure? Let's see. Today is Wednesday. So last
night is what? [Tuesday!] Yes, Tuesday. Okay, so what I did last night. First, I walked my dog.
Do you remember my dog's name? [Murphy!] Good memory. Yes, his name is Murphy. So, first
I walked my dog Murphy. For how long did we walk? [students shrug, one yells out ten
minutes] No, more than ten minutes. [someone says 30 minutes] Good guess! Yes, we walked
for 30 minutes. So last night, first I walked my dog Murphy for 30 minutes. Then I
A second implication is that the explicit teaching, learning, and testing of textbook grammar
rules and grammatical forms should be minimized, as it does not lead directly or even indirectly
to the development of mental representation that underlies language use (if the program wishes
to develop explicit knowledge as a paramount goal and doesn't care about other goals such as
communication or fluency, then and only then might explicit instruction play a central role).
Instructors need to understand that the explicit learning of surface features and rules of lan-
guage leads to explicit knowledge of the same, but that this explicit knowledge plays little to no
role in language acquisition as normally defined. Explicit knowledge can play a role in learner
selfediting, particularly of written compositions, and we leave the development of that topic to
the vast literature on the development of compositional abilities and how a focus on grammar
fits there, if at all (e.g., Bitchner & Ferris, 2012; Hyland & Hyland, 2019; Manchon & Matsuda,
2016). But for the classroom teacher, the time and energy that 20 years ago would have been
dedicated to practicing grammar in some way should simply be redirected to wholelanguage
activities where learners understand language and use it to communicate.
4.1 |There is no single methodology that combines communicatively
embedded input with little to no explicit teaching of grammar
A variety of approaches incorporate the insights described in this paper, including immersion,
contentbased instruction, nontargeted CI (nontargeted means that no specific vocabulary or
grammar structures/forms are the focus of instruction; rather, a new language to be used in
communication is drawn from looking at pictures, movie clips, novellas, and other sources),
TPRS, and inputbased taskdriven classes, among others. Of course, a byproduct of such
approaches involves developing different goals and outcome measures, a point that is beyond
the scope of the present paper. However, it is worth mentioning here that it is often the case
that both instructors and scholars interpret inputbased instructionto mean teaching the
same old thing a new way.Although one could attempt to teach textbook vocabulary and
grammar with communicatively embedded and comprehensible input, this is not at all im-
plicated by the basic findings of L2 research and is not a conclusion to be derived from what we
have discussed in this paper. One reason for this position is that what winds up in people's
heads bears almost no resemblance to textbook rules and formsa point we have underscored
several times in this paper. Another reason is found in the implications of ordered develop-
ment, to which we now turn.
As we outlined earlier in this paper, learners come equipped with internal mechanisms that
organize and guide language acquisition such that the development of mental representation
proceeds in a fashion independent of external attempts to manipulate its development. Certain
forms are acquired before others and there is staged development in the acquisition of parti-
cular structuresand formsjust to mention two of the highlights of ordered development.
For instructors to try to implicitlyteach textbook vocabulary and grammar through input
based approaches is as doomed to failure as is explicit teaching and practice of the same.
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By doomed to failurewe mean that instructors will see no advantage to using input as a
technique to teach the same old thing: Learners will exhibit ordered development in spite of
such external attempts.
On a related note, we sometimes hear from instructors, Shouldn't we use the natural order
of acquisition to organize teaching, then?The answer is, of course, noand the reasons are
multiple. First, the natural order of acquisition has given way to a broader, more compre-
hensive ideaordered developmentas outlined in this paper. So there is no one organizing
principle for how linguistic features are acquired over time. What is more, even if we returned
to the more reduced concept of a natural order,we do not have such orders sufficiently
developed for all languages, for all structures, for all forms, and so on, to be of any use. Finally,
given individual differences in the rate of acquisition, in a given classroom, learners may be at
different points in ordered developmentleaving the instructor with the vexing question of
what to teach to whom and at what point in time. So learners' natural orderof acquisition
should not be used to structure any kind of class syllabus if the goal is acquisition.
Another comment regards the relationship between inputbased and nongrammarbased
approaches to instructed acquisition, on the one hand, and the development of oral proficiency
on the other. Because of the negative reaction to Krashen's ideas in the 1980s, a good deal of
world language teaching settled on the idea that oral proficiency was the result of some version
of presentation + practice (e.g., Omaggio Hadley, 1986). As far as we can tell, this remains the
dominant position today in teacher education programs, textbooks, and other sources. As a
result, many instructors have been perplexed about how a focus on input (i.e., active listening
and reading) could lead to oral proficiency where production is involved. Don't learners need to
practiceoral proficiency? A full discussion of the problems underlying this issue would take
us well beyond the present paper, but we can say the following: A focus on input and inter-
action with that input does not mean that oral proficiency does not develop.
If we stopped for a moment to think about child language acquisition, we would see how
this works. Children are actively engaged in interpreting meaning from the input that sur-
rounds them. They interact with their interlocutors using the abilities and language they have
at their disposal (i.e., first by babbling, then oneword responses and chunked phrases, then two
words, and so on). Oral ability emerges as part of communicative events. This is why we stress
input in this paper as communicatively embedded input. There is no suggestion in inputbased
instruction that learners sit passively and do nothing as they listen to an instructor. To be
actively engaged means for a learner to indicate comprehension through whatever means that
learner has. Just as in child language acquisition, this can be facial expressions, gestures, one
word responses, phrases, and so on. As the research has shown, oral communicative ability
grows out of these interactions. Communication in all of its facets (including productive oral
communication) grows out of communicative interactions and events; it doesn't emerge from
practice in the traditional sense of the word (e.g., Day, 1986; Savignon, 1997). So the question,
Don't learners need to practice oral proficiency?is evidence that what we know about both
how the acquisition of language develops and how communicative abilities develop has not
trickled down into teacher education programs or into professional development for veteran
instructors.
A final comment on instruction regards something we often hear from teachers and cur-
riculum developers alike. It involves the lament that there are only so many contact hours per
week with students. Given the limited time, instructors feel the need to teach all the voca-
bulary and grammarso that students get it.Unpacking this concern reveals two things.
First, it suggests that instructors may believe that textbook vocabulary and grammar is what
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needs to be learned, which we have repeatedly argued is not the case. Second, this concern of
instructors also reveals a belief that acquisition happens or can happen via presentation +
practice, another point we have argued is inaccurate. Instead, acquisition proceeds as a com-
plex interplay between mechanisms that learners bring to the task of language acquisition and
the kind of communicatively embedded input they are exposed to, as well as how they interact
with that input. Research has shown that this process can successfully take place even in
situations with extremely limited input; for example, half an hour a week (Cartford et al., 2015).
In the end, although we understand instructors' concern regarding limited contact time, we
also understand that acquisition is what it is and language is what it is; we can't make them into
something they aren't. Even when instructional time is very limited, communicative, inputbased
approaches are still the best way to grow learners' mental representation of language.
Before we conclude, we would like to briefly mention the assessment of learners. There are
no direct or even indirect implications for assessment based on the points we have raised
hereespecially if the point of assessment is to assign a student a grade in a language course.
Instead, the implication is that the profession needs to engage in serious discussion about
whether traditional grading in institutionalized education is even appropriate for language
classes if their goal is to foster the acquisition and promote the development of communicative
ability. It is easy to assess and assign grades if language is treated like other subject matter (e.g.,
an emphasis on explicit learning and the testing of what was learned). It is difficult to imagine
how we would assess learners when the focus of the classroom involves an inputrich en-
vironment where communicative ability is allowed to evolve, responding to individual differ-
ences of learners, and explicit learning is minimized or perhaps absent. Indeed, perhaps new
models for language education that are quite different from those for, say, history and math
education, are in order; we leave that for the profession to place on an agenda for thoughtful
scrutiny.
5|CONCLUSION
In this paper, we have revisited three of the five major components of Krashen's Monitor
Model/Theory: The acquisition/learning distinction, the natural order hypothesis, and the in-
put hypothesis. We have shown that research since the 1970s has not demonstrated that the
fundamental ideas involved in these three components are wrong. Where necessary, we have
suggested slight modifications based on the accumulated evidence since the early days of L2
research. However, these modifications do not result in any rejection of the components. In a
sense, the field has proceeded the way science does, taking the case of atomic theory and
atomic structure as an example. Originally, atoms were proposed to be something akin to a
miniature solar system with protons and neutrons at the center (e.g., the sun) and electrons
(e.g., the planets) orbiting around this center. Research has shown that the essence of atoms
is still there: Protons and neutrons at the centerand electrons in the periphery,but it has
refined the structure to show that electronic orbits are not circular or elliptical like those of
planets, but instead more erratic. At the same time, protons and neutrons don't just sit there;
they jostle about and vibrate. What is more, science has gone on to explain quantum forces (and
subatomic particles) that we did not know existed at the outset of atomic theory. Yet, the atom
still exists. The structure of atoms and the theory about it were modified but the essence of the
atom is still there: Protons and neutrons somewhere in the center and electrons in the
periphery.
LICHTMAN AND VANPATTEN
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19
We have also outlined basic implications for language instruction based on not just Monitor
Theory, but also on what the research has shown us since the 1970s. The implications are
similar to those made by Krashen. We recognize that for many instructors and textbook wri-
ters/publishers such implications have seemed outlandish and will seem outlandish still. Yet,
the facts are the facts. Our belief is that the basic and fundamental facts about acquisition
facts first hypothesized by Krashen some 40 years agoseem outlandish only because language
acquisition tends to be neglected in both teacher education and professional development.
Sometimes science takes a while to catch on.
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... Krashen (1985) used i to denote the current level of competence, and highlighted the optimal notch of i + 1, the level just above the current proficiency, for language acquisition. Although there are multiple controversies over this hypothesis (e.g., see Lichtman & VanPatten, 2021), it nevertheless highlights the central role that input plays in language acquisition. Both input and comprehension underline the centrality of learners as the receiving end, processing incoming signals that are either spoken (i.e., listening) or written (i.e., reading). ...
... The essence of input for L2/FL learning can be seen in major linguistic, psycholinguistic, and cognitive theories (Lichtman & VanPatten, 2021). However, there are only two channels for receiving language input: Listening (spoken input) and reading (written input), and both strands contribute to overall language proficiency development. ...
... From the participants' proficiency scores, the interviews, and my understanding of the interviewees, not all the input could be classified as comprehensible to them (even with aids such as pictures). Although Krashen's (1985) golden formula of i + 1 may not be exactly precise (see Lichtman & VanPatten, 2021), the level of English these learners chose to expose to was quite clearly far beyond +1. Yet, from the participants' accounts, tremendous language gains were experienced, possibly challenging the very notion of input comprehensibleness and i + 1 for effective FL acquisition in this outside-class self-driven FL exposure context. ...
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Input is indispensable for language learning. Although opportunities for listening and reading, the two only channels of language input, can be scarce outside class in English as a foreign language (EFL) contexts, highly proficient learners often expose themselves to input aplenty. Their experiences of immersing themselves in input and their perceptions of these experiences have received very little attention, yet they bear significant theoretical and practical implications for EFL teaching and learning, especially with regard to less-successful learners. The present study examined the experiences and perceptions of eight successful EFL learners. The data from the qualitative questionnaire and in-depth interviews were analyzed using Interpretative Phenomenological Analysis. Findings that are particularly enlightening, and even surprising, include the prevalence of hedonism (the pursuit of pleasure itself), the specific value of spoken input (listening), the non-necessity for abundant exposure to both forms of input in outside-class contexts, and the challenge to the ossified conventional belief that only reading improves writing and only listening improves speaking. The article culminates with a discussion of these novel, significant findings.
... Even if Krashen's theories have been criticized for not being well supported by empirical studies (e.g., Gregg, 1984;Spolsky, 1985); the Input Hypothesis in particular has contributed to the field by giving prominence to input as well as learners' exposure to it (Lichtman & VanPatten, 2021;White 1987). Pienemann's (1989) Teachability Hypothesis and Learnability Hypothesis, which have been researched for thirty years, offer a complementary perspective on the issue. ...
... In this context, comprehensibility is a sine-qua-non condition for acquisition to take place (VanPatten, Keating, & Wulff, 2020). Accordingly, Lichtman and VanPatten (2021) have recently reformulated Krashen's Input Hypothesis as follows: "The principal data for the acquisition of language is found in the communicatively embedded comprehensible input that learners receive. Comprehension precedes production in the acquisition process" (p. ...
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