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Introduction
Most readers are probably familiar with
some version of the learning pyramid, and
the associated claims that the best way to
learn and remember something is by teach-
ing or doing. The retention of these modes
of learning have been claimed to be as high
as 75, 80 or even 90 percent, whereas
attending lectures, or using other theoret-
ical approaches to learning are in
comparison extremely inefficient, only
resulting in five or 10 percent retention.
Earlier critiques of the learning pyramid
have focused on the dubious origin of the
model (Molenda, 2004; Subramony, 2003),
and have demonstrated inconsistencies
between the pyramid and the research on
retention (Lalley & Miller, 2007).
This article assesses a well-known ver-
sion of the learning pyramid propagated
by NTL Institute. First it will briefly dis-
cuss its origins, and disqualify the claim
that the model is based on research. It will
then raise some essential semantic and
methodological criticisms against this
model. Finally, it will question the idea of
the apparent intuitiveness of the learning
pyramid.
Concluding, it will urge NTL Institute
to retract their model. And, as their learn-
ing pyramid is but one of several versions,
recommend that similar critique ought to
be raised against resembling models.
There is no Learning Pyramid
As point of critique goes, this admit-
tedly seems a conclusive one. However, it
is a matter of semantics, not of ontology.
What normally is referred to as “the learn-
ing pyramid”, are in fact several different
models relating different degrees of reten-
tion from different kinds of learning.
Usually they are quantified by neat per-
centages, like 10, 20, 30, 50 and 90 percent.
In addition, there are several similar
models sometimes named “the cone of
learning”, “the cone of experience”, “the
learning cone”, “the cone of retention”,
“the pyramid of learning”, or “the pyra-
mid of retention”, while others are
unnamed. In order to subsume all these
models under one concept this article sim-
ply refers to them as the “learning
pyramid”, as this seems to be the most
common term.
Thus, it is impossible to criticize the
learning pyramid itself, as there is none,
and an attempt to criticize them all is unre-
alistic. However, NTL Institute’s model is
an obvious candidate for critique. Numer-
A REBUTTAL OF NTL
INSTITUTEʼS LEARNING PYRAMID
KÅRE LETRUD
Lillehammer University College
This article discusses the learning pyramid propagated by
National Training Laboratories Institute. It presents and comple-
ments the historical and methodological critique against the
learning pyramid, and calls for NTL Institute to retract their
model.
Keywords: Learning Pyramid; NTL Institute; National Training
Laboratories Institute.
117
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ous findings refer to NTL Institute as the
source of their model (see for instance:
Borthick & Jones, 2000; Busby & Hub-
bard, 2007; Chun, 2004; Darmer,
Ankersen, Nielsen, Landberger, Lippert &
Egerod, 2004; DeKanter, 2005; Fu, Su
&Yu, 2009; Garden, 2009; Hazlett, 2009;
Hoon, Emerson & White, 2006; Janavaras
& Gomes, 2007; Janavaras, Gomes &
Young, 2008; Katsuragi, 2005; Magennis
& Farrell, 2005; Morgan, 2003; Peteroy-
Kelly, 2007; Peterson, Rowat, Kreiter, &
Mandel, 2004; Qayumi, 2006; Roettger,
Roettger & Walugembe, 2007; Sousa,
2006; Thier, 2005; Thomas & Baker, 2008;
Wagner, Wagner & Jayachandran 2005;
Williams, Hawes & Foley, 2006; Wood,
2004; Zainal, 2011; Zhang & Su, 2007).
NTL Institute’s willingness to be asso-
ciated with the pyramid makes them in no
small part responsible for the spreading of
the model. They confidently and consis-
tently claim to have performed studies
supporting one of the pyramids:
Thanks for your interest in NTL
Institute. We are happy to respond to
your inquiry about The Learning
Pyramid. It was developed and used
by NTL Institute at our Bethel,
Maine campus in the early sixties
when we were still a part of the
National Education Association's
Adult Education Division.
While we believe it to be accurate,
we no longer have- nor can we find-
the original research that supports
the numbers.
We get many inquiries every month
about this- and many, many people
have searched for the original
research and have come up empty
handed. We know that in 1954 a sim-
ilar pyramid with slightly different
numbers appeared on p. 43 of a book
called Audio-Visual Methods in
Teaching, published by the Edgar
Dale Dryden Press in New York
however the Learning Pyramid
as such seems to have been modi-
fied and remains attributed to NTL
Institute.
To summarize the numbers (which
sometimes get cited differently) learners
retain approximately:
90% of what they learn when they teach
someone else/use immediately.
75% of what they learn when they
practice what they learned.
50% of what they learn when
engaged in a group discussion.
30% of what they learn when they
see a demonstration.
20% of what they learn from audio-
visual.
10% of what they learn when they've
learned from reading.
5% of what they learn when they've
learned from lecture.
118 / Education Vol. 133 No. 1
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(NTL Institute, Personal Communi-
cation, October 14. 2009)
This seems to be a standard formulation
offered to those enquiring about the model,
as others have also reported correspon-
dence with the same wording (See Booth,
2011, p. 41; Lalley & Miller, 2007; Magen-
nis & Farrell, 2005; Polovina, 2011;
Thalheimer, 2006). NTL Institute’s reply,
however, fails to reassure. If the method-
ology and data behind the model are
missing, we have no way of evaluating the
results.
How, for instance, did they ensure that
the different rates of retention were
affected only by the difference in learning
methods? Did they test the retention of
general knowledge, a series of random
names, number, letters or symbols, or did
they test some kind of skill? How long did
they wait between learning and testing?
What were the subjects’ age, sex, and gen-
eral background, and how many were they?
Furthermore, we may concur with Lal-
ley and Miller when they describe what
“daunting task” this kind of study would
be:
There is an implied assumption that
these methods have been compared to one
another in a systematic manner employ-
ing sound research methodologies. At a
minimum, these empirical issues would
include:
* That each of the methods, employed as
an experimental treatment, was of the
same duration (e.g., a student's reading
session would last as long as an indi-
vidual teaching or discussion session).
* That each of the methods would have
be conducted or supervised by the same
teacher or that multiple teachers would
have been matched in terms of educa-
tion, teaching experience and subject
area (e.g., the lecture being given by
the same teacher as the one leading the
discussion). Further, the teacher(s)
should have been well versed in both
content and method.
* That the content to be learned with each
method would be the same, regardless
of the method being employed.
* That the outcome measure(s), or depen-
dent variable(s), was one measuring
retention, the ability to recall or do
something after a time delay (e.g., days,
weeks or months), rather one that is
completed immediately after treatment.
(2007, p. 68,69)
Without this and other necessary infor-
mation on how the claimed study was
supposed to have been performed, we are
unable to judge the generalizability, valid-
ity and reliability of the model’s claims.
NTL Institute’s learning pyramid is
unsupported by empirical research
A scientific theory consists basically of
a model, and a theoretical hypothesis, the
latter being a concomitant claim that this
model resembles, or somehow “fits” the
world (Giere 1997); Scientific theories usu-
ally describe and explain parts or specific
aspects of the world, like the planetary
movements of our solar system, or the
structure of DNA. Such models can include
scale models, analogue models, and in the
case of the learning pyramid; theoretical
NTL Institute’s Learning Pyramid… / 119
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models.
The main criterion for evaluating a the-
oretical hypothesis is whether the model
corresponds to the part of reality it is sup-
posed to represent. This is done by
deducing an empirically testable proposi-
tion, a prediction. A confirmed prediction
normally serves as support for the model.
On the other hand, if there are other mod-
els that could equally well predict the same
data, or if the confirmed predictions oth-
erwise offer no real support to the model,
the data are deemed inconclusive. Further,
a failed prediction may in turn lead to the
model being rejected (Giere 1997).
However, there seems to be no empir-
ical support for the claim that the learning
pyramid presents a fitting description of
learning and retention. In their reply, NTL
Institute state that they are unable to pre-
sent any studies that support their model,
and hence fail to fulfill the burden of evi-
dence that follows their claim of the
model’s empirical status.
Contrary to NTL Institute’s history of
the model, it has been demonstrated that
the learning pyramids have been produced
through a synthesis of two separate and
untenable ideas (Lalley & Miller, 2007;
Molenda, 2004; Subramony, 2003):
The first is a misconstruing of Edgar
Dale’s “cone of experience”, presenting it
as a model of learning efficiency. Dale
originally presented the model as a visual
aid for classifying learning methods
according to their level of abstractness and
concreteness, and explicitly stated that it
was not intended as “a hierarchy or rank
order of learning processes”. (Dale, 1946,
47). His cone was not describing retention
at all, and neither the 1946, the 1954 nor
the 1969 version of the cone contained any
numbers.
The second idea stems from an old
retention chart. This chart is a set of rates
of retention associated with reading, see-
ing, hearing, saying and doing. These
percentages have been traced back to the
early 1940s (Molenda, 2004), but we have
lately found that they were published sev-
eral times between 1906 and 1940 (Letrud
2012).
Even though our knowledge of the ori-
gin of the percentages of the learning
pyramids is incomplete, the NTL Insti-
tute’s belief in having performed any
original research seems somewhat opti-
mistic. Indeed, the retention chart precedes
the founding of this institution in 1946 by
at least 40 years.
Making predictions from the model
Rejecting a model due to lacking empir-
ical support may be hasty if such evidence
in turn may be produced. But in order to
test the learning pyramid and to measure
the relative efficiency of the learning
modes, the model’s rudimentary categories
need to be thoroughly modified for them
to be operationalized. An empirical inter-
pretation of the model in its present state
could only be highly arbitrary, and subse-
quently the learning pyramid of NTL
Institute is hardly testable.
Some categories are ambiguous. Con-
sider the sentence “learners retain
approximately: 90% of what they learn
when they teach someone else/use imme-
diately.” The syntax allows for two
interpretations that are equally plausible,
but only partially consistent with each
other: is it adequate to “teach someone
120 / Education Vol. 133 No. 1
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else” or must we “teach someone else
immediately” in order to retain 90 percent?
The content of the term “learn” shifts
depending on the category. When related
to reading, lectures, audiovisual aids, and
demonstrations, “being presented with, or
acquiring information” seems a plausible
interpretation. While in the context of prac-
ticing, using and teaching, “learn”
apparently takes on a new and different
meaning, indicating something along the
lines of “processing and understanding
information”. In the category “discussion
in groups”, “learn” is equally open to both
interpretations, since we both are present-
ed with information, as well as contributing
our own conceptions and ideas into the dis-
cussion.
The difference between “practice” and
“use” in the categories “practice what they
learned” and “use immediately” is not
clear, because these terms are sometimes
synonymous. Furthermore, while
“practice” can signify repetitions in order
to improve one’s performance, or
retention of a subject matter, it may also
signify the translation of theoretical knowl-
edge into actions or judgments, as in
“practicing medicine”.
And finally, what kind of retention does
the pyramid describe – long-term, or short-
term memory? The category “immediate
use” suggests that the aim is to transfer the
information from short-term to long-term
memory by repetition. The other categories
are unclear in this respect.
Even if the model were changed accord-
ing to these objections, thereby making the
model more suitable for testing, it would
only produce valid answers to a limited
extent:
The categories are, as suggested earli-
er, not discrete. These ought to be
adequately separated and defined, so that
they can be examined and evaluated on
their own. The claimed 90 percent reten-
tion gained by teaching others is in this
context paradoxical – because the reason
that teachers know the material they teach
in the first place, is because they them-
selves have prior knowledge (Lalley &
Miller, 2007) from years of attending lec-
tures, reading, discussions, and
demonstrations. They have also been prac-
ticing – in both meanings of the word.
Hence, their competence is a result of all
these low- or semi efficient modes of learn-
ing. Even though it is an important
motivator, it is far from evident that teach-
ing is a form of learning.
The same critical point can be made of
the audio-visual presentations. These often
include text, lectures and demonstrations,
thereby making it hard to evaluate the
impact of audio-visual technology.
These problems might be solved, if the
model’s percentages are intended to be
additive, and not discrete. However, this
interpretation will present major difficul-
ties in separating the effect of the learning
methods from the well-known and well-
supported effect of repetition.
The intuitiveness of the learning pyramid
But, some might argue, considering the
length of time the model has been with us
and to the extent it has spread, surely this
must indicate that it conveys some essen-
tial truths on learning. One cannot help
thinking that a major reason why it has
spread so efficiently is that it corresponds
to all these authors’ scientific knowledge
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of education as well as their professional
experience.
First of all, even if some experiences
of learning come easier to mind than oth-
ers, the ease of recollection and the
vividness of memories of situations where
learning took place may not be represen-
tative of how we actually learn. For
instance, the laborious and tedious process
of reading, writing and repeating in order
to retain and understand is anything but
memorable.
Secondly, it is no wonder that we expe-
rience that the model’s most efficient forms
of learning, discussions, practice, imme-
diate use or teaching others, have made
several major contributions to our grasp of
different subject matters. They are them-
selves parts of learning processes that
involves attending lectures, reading and
writing, and their discrete contribution to
these processes cannot easily be distin-
guished. They can, however, easily be
overemphasized.
Thirdly, I have doubts that the authors
who reproduce the model adhere to more
than one, or maybe two of the categories.
There are probably few who have strong
feelings concerning the percentages asso-
ciated with, say demonstrations. Most tend
to stress the lower and upper categories,
because they find the learning pyramid
confirms their general preference for active
learning strategies over passive ones, hence
resonating with several pedagogical
theories that are currently in vogue. And
lastly, the burden of evidence is not ful-
filled by claiming that the model seems
reasonable
Conclusion
NTL Institute’s learning pyramid lacks
empirical evidence, and any attempt to per-
form empirical tests of the model will
encounter major methodical problems.
Despite its inability to stand up to close
examination, the model is still corrobo-
rated by NTL Institute. The continued
distribution of this model cannot be justi-
fied, and in order to reduce further
dissemination, NTL Institute ought to
retract it.
Presentations of other versions of the
learning pyramid also need to be con-
fronted with correspondingly critical
questions in order to clarify the scientific
statuses of these models. If these cannot be
adequately satisfied, one should abstain
from using them all together.
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