Temperament and the Myers-Briggs Type Indicator are often treated as synonyms — both described vaguely as "personality types" — but they describe different things using different methods and with different theoretical foundations. Understanding where they overlap, where they diverge, and what each adds to the other gives you a much richer picture of personality than either provides alone. The connection is real but partial, and the differences are as instructive as the similarities.
What Temperament Refers To
In contemporary psychological usage, temperament refers to early-appearing, biologically influenced personality tendencies. The defining features are that they show up early in life (often in infancy), are relatively consistent across situations, and have a substantial heritable component. Temperament is not destiny — environment shapes and interacts with it continuously — but it represents a more dispositional and biologically grounded layer than what most adults mean when they say "personality."
There are several competing temperament models in developmental psychology. Thomas and Chess identified nine dimensions including activity level, regularity, and emotional intensity. Buss and Plomin proposed the EAS model: Emotionality, Activity, and Sociability. Kagan's work focused on behavioural inhibition. The common thread is the emphasis on early-appearing, biologically influenced tendencies rather than cognitively acquired preferences.
The classical four temperaments (sanguine, choleric, melancholic, phlegmatic) use the word differently — they're a pre-scientific folk psychology that identified recognisable personality patterns without making strong biological claims. They're historically significant and have real descriptive validity, but they're not the same as what developmental psychologists mean by temperament today.
What MBTI Measures
The Myers-Briggs Type Indicator, developed by Isabel Briggs Myers and her mother Katharine Cook Briggs based on Carl Jung's theory of psychological types, measures four dichotomies: Extraversion vs. Introversion, Sensing vs. Intuition, Thinking vs. Feeling, and Judging vs. Perceiving. The combination produces one of sixteen four-letter types.
MBTI is explicitly a measure of cognitive preferences — the ways people prefer to take in information and make decisions. It doesn't directly measure biological temperament as developmental psychologists define it; it's closer to a framework for conscious preferences and cognitive style. The theory assumes these preferences are stable and meaningful, though the psychometric research on MBTI has significant concerns about test-retest reliability and construct validity.
Where They Overlap: The Keirsey Bridge
The most explicit connection between temperament and MBTI was made by David Keirsey, who in Please Understand Me (1978) and Please Understand Me II (1998) proposed that the sixteen MBTI types could be organised into four temperament groups corresponding to combinations of the S/N and J/P dichotomies:
- SP (Artisan) — Sensing-Perceiving types (ISTP, ISFP, ESTP, ESFP). Keirsey mapped these to the sanguine classical temperament: action-oriented, adaptable, pleasure-seeking, skilled at responding to immediate circumstances.
- SJ (Guardian) — Sensing-Judging types (ISTJ, ISFJ, ESTJ, ESFJ). Mapped to phlegmatic: duty-oriented, reliable, hierarchically respectful, preserving of established structures.
- NF (Idealist) — Intuitive-Feeling types (INFP, INFJ, ENFP, ENFJ). Mapped to melancholic: identity-seeking, idealistic, sensitive to meaning, concerned with authenticity.
- NT (Rational) — Intuitive-Thinking types (INTP, INTJ, ENTP, ENTJ). Mapped to choleric: knowledge-seeking, achievement-oriented, strategically focused, driven by competence.
Keirsey's framework has been widely used and describes recognisable patterns. But it's important to understand that this is a proposed correspondence, not a validated finding from research on both frameworks simultaneously. The four groupings describe something real about MBTI variation; whether they map cleanly onto classical temperaments or developmental temperament research is a more contested question.
Where They Diverge
Several important differences remain:
Time horizon. Temperament (in the developmental sense) is measured in infants and toddlers; MBTI preferences are typically assessed in adolescents and adults. Temperament describes what you were born with; MBTI describes what you've developed into, which is influenced by temperament but also by environment, experience, and conscious cultivation.
Biological vs. cognitive framing. Developmental temperament is explicitly biological — about nervous system reactivity, arousal thresholds, and regulatory capacity. MBTI is about cognitive preferences that need not have strong biological correlates. The E/I dimension has the strongest overlap with biological temperament research; S/N, T/F, and J/P have weaker connections.
Measurement maturity. Developmental temperament scales have been through decades of psychometric refinement in well-defined populations. MBTI has significant reliability and validity concerns that limit its use in research contexts, though it remains widely used in organisational settings.
What Each Adds to Self-Understanding
If you're interested in understanding your personality comprehensively, the two frameworks are complementary rather than redundant:
Temperament research points you toward biological givens — the dimensions of your personality that are most heritable, most stable, and most important to accommodate rather than fight. If you're highly reactive emotionally (high Emotionality in EAS terms), that's information about your baseline neurological state that has different implications than if you're behaviourally inhibited in Kagan's sense.
MBTI-type frameworks point toward cognitive preferences and processing styles — how you prefer to take in information, make decisions, and structure your time. This is more amenable to development and has more direct implications for how you'll function in different roles and environments.
The Big Five personality model provides the most robust empirical framework for adult personality — it correlates with MBTI dimensions and has better psychometric properties. For a portrait of your personality traits, our free Big Five personality test gives precise scores with substantial research support behind each dimension.
Frequently Asked Questions
Is temperament the same as MBTI type?
Not exactly. Temperament in developmental psychology refers to early-appearing, biologically influenced personality tendencies. MBTI measures cognitive preferences developed over time. The Keirsey Temperament Sorter explicitly maps four MBTI groupings onto temperament categories, but this is a proposed correspondence, not an established psychometric equivalence.
Which MBTI types correspond to which temperaments?
In Keirsey's framework: SP types (Artisan/sanguine), SJ types (Guardian/phlegmatic), NF types (Idealist/melancholic), NT types (Rational/choleric). The mapping is approximate and based on observed behavioural similarities rather than direct empirical derivation from both frameworks simultaneously.
Is temperament fixed at birth?
Partly. Temperament has significant heritable components and shows up in early infancy, which is what makes it distinct from adult personality as typically measured. But temperament interacts with environment throughout development — the same temperament expressed in different environments produces quite different adult personalities. "Fixed" is an overstatement; "constrained" is more accurate.
Can your MBTI type be predicted from your temperament?
Partially and imperfectly. The E/I dimension has the strongest overlap — behavioural inhibition in childhood (a temperamental dimension) predicts adult introversion reasonably well. The other MBTI dimensions have weaker direct connections to developmental temperament research. Environmental and experiential factors play substantial roles in shaping adult preferences.
Which is more useful — temperament or MBTI?
Depends on the question. Temperament frameworks are more useful for understanding early development, parenting, and the biological bases of personality. MBTI-type frameworks are more directly applicable to adult work preferences, communication styles, and team dynamics — which is why they've been adopted heavily in organisational contexts despite their psychometric limitations.