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Myers-Briggs Type Indicator (MBTI): Some psychometric limitations

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Abstract

The present paper critically reviews the psychometric adequacy of the Myers-Briggs Type Indicator (MBTI). Although the instrument is extremely popular in applied settings, there is an urgent need for the development of valid and comprehensive local norms, in order to increase its predictive validity and utility within the Australian context. In addition, there are a number of psychometric limitations pertaining to the reliability and validity of the MBTI, which raise concerns about its use by practitioners. In view of these serious limitations, routine use of the MBTI is not recommended, and psychologists should be cautious as to its likely misuse in various organisational and occupational settings
Bond University
ePublications@bond
Humanities & Social Sciences papers Faculty of Humanities and Social Sciences
3-1-1995
Myers-Briggs Type Indicator (MBTI): Some
Psychometric Limitations
Gregory J. Boyle
Bond University, Greg_Boyle@bond.edu.au
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Gregory J. Boyle. (1995) "Myers-Briggs Type Indicator (MBTI): Some Psychometric Limitations" ,,
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http://epublications.bond.edu.au/hss_pubs/26
Myers-Briggs Type Indicator (MBTI):
Some Psychometric Limitations
GREGORY J. BOYLE
Bond University
The present paper critically reviews the psychometric adequacy of the Myers-Briggs Type Indicator (MBTI).
Although the instrument is extremely popular in applied settings, there is an urgent need for the development
of valid and comprehensive local norms, in order to increase its predictive validity and utility within the
Australian context. In addition, there are a number of psychometric limitations pertaining to the reliability
and validity of the MBTI, which raise concerns about its use by practitioners. In view of these serious
limitations, routine use of the MBTI is not recommended, and psychologists should be cautious as to its likely
misuse in various organisational and occupational settings.
The Myers-Briggs Type Indicator or MBTI (Briggs-Myers & Briggs, 1985) is an extremely popular
personality inventory which has received widespread use over the last 30 years (Carlyn, 1977). The
MBTI is a self-report questionnaire designed to quantify non-psychopathological personality types
as postulated in Jung's psychodynamic type theory (see Myers & McCaulley, 1985).
Each individual's personality type is described in terms of a four-letter code, a brief descriptive
interpretation of which is provided on the back of the report form. For a simple (four-dimensional),
straightforward description of one's personality make-up, use of the MBTI would seem an
appropriate choice. The instrument is ipsatively scored, and predominantly utilises forced-choice
(true/false) items. Four dichotomous dimensions classify individuals either as extraverted (E) or
introverted (I), sensing (S) or intuitive (N), thinking (T) or feeling (F), and judging ( J) or perceiving
(P). Combinations of the four preferences determine personality types. Each individual is classified
in terms of one of 16 possible four-letter codes (such as ESFJ, ENFP, INTP, and ISFJ). Each type is
said to define a specific set of behavioural tendencies, reflecting differences in attitudes, orientation,
and decision-making styles. All materials, including the manual, test booklets, answer sheets, and
score keys, are professionally produced.
The Jungian construct of extraversion is embedded within a somewhat different conceptual
framework than either Cattellian or Eysenckian interpretations. The E-I dimension does not pertain
to shyness versus gregariousness, but focuses on whether one's general attitude towards the world is
actively oriented outward to other persons and objects, or is internally oriented (Sipps & Alexander,
1987). The S-N dimension describes the individual's characteristic perceptual style. Sensing is
viewed as attending to sensory stimuli, whereas intuition involves a more detached, insightful
analysis of stimuli and events. Somewhat reminiscent of the field dependence-independence
distinction, for the T-F dimension, thinking involves logical reasoning and decision processes, while
feeling entails a more subjective, interpersonal approach. Thomas (1983) reported a correlation
between field independence and thinking of 0.37, suggesting a small amount of commonality. The J-
P dimension distinguishes between the judging attitude associated with prompt decision making
(often before all facts are at hand), while perception involves greater patience and waiting for more
information, before making decisions (cf. Thomas, 1984). The individual is typed as either one or
the other (each dimension is discontinuous, rather than continuous). Willis (1984, p. 483) indicated
that the J-P dimension determines which of two function preferences is dominant and which is
auxiliary (S or N versus T or F). The auxiliary style is used only in unusual situations; such as when
an introverted child is required by the school system to "play the role" of an extraverted individual.
DeVito (1985, p. 1030) asserted that"the dominant and auxiliary function is not well developed in
Jung's writings (see McCaulley, 1981, pp. 301-302) and is the most controversial aspect of Myers'
interpretation of Jung". To date, the validity of the dominant and auxiliary functions has not been
tested empirically.
The four main MBTI dimensions can be placed within the context of modern thinking about
personality theory concerning the major dimensions of Neuroticism, Extraversion, Openness,
Agreeableness, and Conscientiousness (see Digman, 1990; Goldberg, 1992). Additionally, in the
most comprehensive higher-order factor analytic study of personality dimensions to date, Krug and
Johns (1986) carried out a scale factoring of the 16PF on well over 17,000 individuals, and
crossvalidated their findings across sex. They reported six second-order factors labelled:
Extraversion, Neuroticism, Conscientiousness, Tough Poise, Control, and Intelligence. These
dimensions have been verified independently in a higher-order factor analysis of the Cattell,
Comrey, and Eysenck scales by Boyle (1989). The E-I dimension of the MBTI relates directly to the
Extraversion-Introversion higher-stratum factor; the S-N dimension appears to relate to Tough Poise
– Sensitivity (i.e., sensing individuals may exhibit scepticism and tough poise, whereas intuitive
persons appear to be more sensitive); and both the T-F and J-P dimensions appear to relate
somewhat to Conscientiousness, Control, and Intelligence, and to the Openness dimension in the
Norman Big Five, as implemented in say the NEO-PI (Costa & McCrae, 1992). The MBTI appears
to measure about 30-35% of the normal personality trait variance. However, it clearly places a
proportionately greater emphasis on cognitive styles than do most other personality instruments.
Current Forms of the MBTI
The 126-item Form G which is now the standard version of the MBTI (cf. Leiden, Veach, &
Herring, 1986) was constructed from the 166-item Form F, with nine items slightly reworded to
reduce reading level, and with 38 experimental items and two other items removed. Only the first 95
items need be answered to score the instrument. As Coan (1978, p. 973) pointed out, inclusion in
Form F of the experimental items (not used for scoring purposes) serves only to increase testing
time, and provides no relevant information for standard use of the instrument. Misunderstanding of
items is potentially problematic. As well, an abbreviated version (A V) also exists, comprising only
50 items. The manual provides normative data for high school and university student samples, but
data for the general adult population is notably lacking. There is little empirical information on
minorities or working-class populations.
Scoring of the Instrument
Scoring of the MBTI is either in terms of preference or continuous scores. According to the manual,
continuous scores are appropriate for research purposes only.1 As stated by DeVito (1985), use of
continuous scores is not emphasised. Jungian theory underlying construction of the MBTI asserts
that an individual's dichotomous preference scores symbolise fundamental differences between types
(e.g. introverts versus extraverts). However, most psychometricians regard personality dimensions
such as extraversion-introversion as continuous, and normally distributed. According to Wiggins
(1989, p. 538), "The principal stumbling block to more widespread acceptance of the MBTI lies in
the structural model of bipolar discontinuous types to which the test authors are firmly committed."
Consequently, use of dichotomous forced-choice items greatly limits both the theoretical and
statistical import of the MBTI. Wiggins argued that there is no evidence to support Jung's theory of
bimodal distributions of preference scores, and that evidence of stability of types is lacking. Thus, as
Wiggins pointed out, the four-variable types remaining stable across measurement occasions exceeds
50% only rarely. Another problem is "considerable redundancy in the scoring operation because the
two contrasting scales of each pair are scored on the basis of essentially the same items". (Coan,
1978, p. 974).
Item Homogeneity
Use of preference scores (with concomitant restriction in variance) requires computation of phi
coefficients if both variables represent true dichotomies (Gorsuch, 1983, p. 296). According to
Willis (1984), median phi estimates of item homogeneity for Form Fare .60 (E-I), .69 (S-N), .59 (T-
F), and .71 (J-P), and median tetrachoric correlations (if the dichotomous variables actually represent
continuous dimensions) are .76 (E-I), .87 (S-N) , .78 (T-F) , and .80 (J-P). The inconsistency of these
dichotomous preference score estimates has been alluded to by Carlyn (1977).
Item homogeneity estimates based on the continuous scores are .79 (E-I), .81 (S-N), .78 (T-F), and
.82 (J-P). Nevertheless, item homogeneity estimates based on continuous scores may be
inappropriate given the assumption underlying the MBTI of dichotomous dimensions (even though
continuous scores provide greater precision than do dichotomous scores). These estimates suggest
moderately high levels of item homogeneity, and the possibility of associated item redundancy and
narrow breadth of measurement (Boyle, 1987, 1991; Cattell, 1978).
Test-Retest Reliability
McCaulley (1981) has investigated the test-retest reliability (stability) of the MBTI. Estimates of the
proportion of preferences reclassified into the same categories ranged from 61 % to 90%. For
continuous scores, median stability coefficients are .78 (E-I), .78 (S-N), .69 (T-F), and .74 (J-P),over
intervals from five weeks to 21 months. For Form G, the corresponding Spearman-Brown corrected
estimates (cf. Ferguson, 1981) are .73 (E-I), .69 (S-N), .64 (T-F), and .69 (J-P). Likewise, for the
abbreviated version (Form A V), the corresponding Spearman-Brown corrected estimates are .52
(E-I), .47 (S-N), .42 (T-F), and .42 (J-P). However, little direct information for Forms G and A V is
available (Carskadon, 1979, 1982). Clearly, Form G is less reliable than Form F (because of the
reduction in number of items), and Form A V is considerably less reliable than Form G. These test-
retest estimates for the current forms of the MBTI indicate some instability. For enduring personality
dispositions, stability estimates should be in the 0.8 to 0.9 range (see Boyle, 1985).
Validity
Reviews supportive of the validity of the MBTI have been provided, for example, by Carlyn (1977),
and Carlson (1985). According to Carlson (p. 357), "literature on the scale (one bibliography lists
approximately 700 references) reflects largely successful efforts to apply it in a large variety of
educational, clinical, counselling, business, and research settings." Despite these claims, the
psychometric limitations of the MBTI raise concerns about the validity of the instrument.
Using continuous scores, the instrument has been correlated with several well known psychological
inventories(Corman & Platt, 1988; Schurr, Ruble, & Henriksen, 1988). Yet there has been little
attempt to ascertain inter-battery relationships via multiple regression procedures. Evidence
concerning the interrelationships of the MBTI with other well known personality inventories remains
mostly at the simple correlational level. Interpretations of concurrent validity based solely on
correlations are likely to be biased due to the unreliability of correlation coefficients (Detterman
1979).
There have been several factor analyses of the MBTI (e.g. Sipps, Alexander, & Friedt, 1985;
Thompson & Borrello, 1986a, 1986b; Tzeng, Outcalt, Boyer, Ware, & Landis, 1984) - (see Carlyn,
1977, for a summary of earlier factor analytic studies). In general, these factor analyses have
followed variants of the "Little Jiffy" procedure (principal components plus orthogonal varimax
rotation, an inadequate method of exploratory factor analysis; see Boyle, 1988, pp. 742-745;
Gorsuch, 1983; McDonald, 1985). Therefore, the results of these analyses which claim to support
the independence of the four MBTI dimensions are unsatisfactory, and in part may be a statistical
artifact due to (a) extraction of at four factors, and (b) use of inappropriate orthogonal rotation. More
appropriate confirmatory factor analyses of the MBTI dimensions remain to be undertaken (e.g. via
LISREL, COSAN, EQS). The question is not whether other structures can be found for the MBTI (a
common result from exploratory factor analyses), but whether the purported structure of the
instrument is valid-a confirmatory rather than an exploratory issue (cf. Joreskog & Sorbom, 1989).
Undue reliance on exploratory factor analyses of the MBTI to the exclusion of confirmatory methods
has undoubtedly resulted in theory conflation, rather than more appropriately discriminating between
hypotheses.
Regarding predictive validity, Myers (1962, p. 77) recommended that the MBTI is best viewed "as
affording hypotheses for further testing and verification rather than infallible expectations of all
behaviors". Since the MBTI types are not "source traits" verified factor analytically (i.e., "causal"
psychological dimensions), predictions based on these "surface traits" (discontinuous types) are
inevitably less powerful and remain somewhat speculative. On a different note, there are no scales
built into the MBTI to detect the effects of random responding, response sets such as social
desirability, or either conscious or unconscious response distortion. Social desirability response set
appears to influence scores on the EI and JP scales (McCaulley,1981, p. 339). Also, there is no
control for the mood of the respondent, which may greatly affect responses (Howes & Carskadon,
1979). Consequently, the issue of motivational distortion in the MBTI responses needs to be
addressed.
Conclusions
The MBTI is one of the most frequently used instruments for personality assessment. However, as
Bjork and Druckman (1991) pointed out, the instrument's popularity is not consistent with research
evidence. Furthermore, the MBTI manual does not provide norms based on continuous scores. Much
of the supporting evidence provided in the manual is of questionable validity (Coan, 1978). Reliance
on dichotomous preference scores rather than continuous scores unduly restricts the level of
statistical analysis (such as assigning frequencies to the 16 types). As DeVito (1985, p. 1032)
indicated, "The issue regarding type vs. continuous scores will probably remain most unsettling for
those espousing traditional test construction standards and procedures." Empirical evidence does not
strongly support the Jungian notion of discrete or "true" dichotomies.
As well, there are problems in using MBTI preference scores to predict behavioural or occupational
outcomes. In addition, test-retest estimates raise doubts about the stability of MBTI-type scores.
Some investigators (e.g. Anastasi, 1990) have suggested that all personality questionnaires have
dubious psychometric standing. Certainly, the problems associated with item transparency, and
concomitant response distortion ranging all the way from lack of self-insight to deliberate faking, as
well as the effects of response sets in general, apply universally to self- report questionnaires (Boyle,
1985).
Bjork and Druckman (1991) asserted that most of the extant studies of the MBTI are defective and
that there is insufficient research into the utility of the MBTI in organisational settings. They further
argued (p. 99) that, "At this time, there is not sufficient, well-designed research to justify the use of
the MBTI in career counseling programs. Much of the current evidence is based on inadequate
methodologies. "
Overall, the MBTI provides a psychometrically simple description of Jungian personality types.
Although this brief characterisation may be useful in some applied contexts (such as in predicting an
individual's characteristic style of behaviour, intellectually and interpersonally), there are evident
psychometric limitations of the instrument. With further research and refinement, the MBTI may
serve a more useful role in applied psychological assessment. Certainly, development of valid and
comprehensive local norms (including relevant motivational distortion scales, e.g. Faking Good;
Faking Bad) should increase its predictive validity within the Australian context. Given the lack of
appropriate local norms, it would seem prudent for practitioners to be alert to its possible misuse,
and to be cautious in undertaking personality assessments with the instrument. The current
enthusiasm for the METI is certainly not warranted on psychometric grounds.
Footnote
1. This viewpoint is contentious. Psychometrically, a continuous scoring system should be used with
at least four to five response options per question (cf. Joreskog & Sorbom, 1988).
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... In other words, personality is a collection of the traits that contribute to an individual's distinct personality. Nowadays, many different types of personality models are utilized to characterize personalities, such as the "Big Five Personality Traits model" [3], "VIA Classification of Character Strengths" [4], "Myers-Briggs Type Indicator (MBTI)" model [5,6], and "Jung's Theory of Personality Type models". It has been discovered that "MBTI" is more powerful because it has a broader application in a variety of disciplines. ...
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... Another important aspect that other studies have explored is related to the possible psychometric limitations of MBTI. In [19], it is mentioned that the instrument does not provide norms based on continuous scores and also raises doubts about its stability, citing examples in which the performance of test-retests demonstrated instabilities in the consequent results of the instrument. This topic regarding the reliability of MBTI (test-retest) is also discussed in [20] suggesting the need for further studies to be carried out at MBTI in order that its validation can be subjected to statistical techniques that guarantee greater trust regarding the validity of its results. ...
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Thesis
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, Summmy.-Test-retest reliabilities of continuous scores on the MyersBriggs Type Indicator scales were examined for 64 male and 70 female college students, using an 8-wk. test-retest interval. Reliabilities were generally satisfactory (n ranging from .73 to .87) with the exception of scores for males on the Thinking-Feeling scale (r = .56). The Myers-Briggs Type Indicator (Myers, 1962) attempts a psychometric representation of Carl Jung's (1923) theory of type. The four scales of the Myers-Briggs Type Indicator measure preferences for extraversion vs introversion (E-I) , sensing vs intuition (S-N) , thinking vs feeling (T-F), and judgment vs perception (J-P). Continuous scores are used to indicate both the direction and strength of the preference on each scale. Scores over 100 (the division point) represent preferences for introversion, intuition, feeling, or perception, depending on the scale, with higher scores indicating stronger preferences; scores under 100 represent preferences for extraversion, sensing, thinking, or judgment, with lower scores indicating stronger preferences. Although the Myers-Briggs has been used increasingly as a research and counseling instrument in the last fifteen years, test-retest reliability studies have been surprisingly few. Stricker and Ross (1964) used a rather long, 14-mo. testretest interval with 41 male Amherst College students. Test-retest correlation coefficients for continuous scores ranged from .69 to .73 for all scales except Thinking-Feeling, which was .48. Levy, Murphy, and Carlson (1972) tested 146 male and 287 female college students, all black, at Howard University, using an 8-wk. test-retest interval. Coefficients obtained ranged from .69 to .80 for the males and .78 to .83 for the females. The present study was designed to measure test-retest reliabilities of continuous scores on the four Myers-Briggs dimensions, using a moderate time interval and a population typical of that used in psychology experiments. Subjects were 64 male and 70 female introductory psychology students at Mississippi State University. Participation partially fulfilled a course requirement. Subjects filled out Form F of the Myers-Briggs initially and on retest 7 wk. later, using the standard test instructions each time. Test-retest correlation coefficients were calculated for continuous scores on each of the four scales, using the Pearson r formula. Males and females were considered separately. The coefficients obtained and the means and standard deviations for each group are shown in Table 1.l All coefficients were sig