How do MBTI types correlate with classical temperaments?

SP types (sanguine) are action-oriented. SJ types (phlegmatic) are duty-oriented. NT types (choleric) are logic-focused. NF types (melancholic) are values-focused. Keirsey explicitly grouped MBTI types into these four temperaments.

Is MBTI based on temperament theory?

Not directly. Myers-Briggs built on Jung's type theory. Keirsey later grouped MBTI types into four temperaments, creating explicit connection. MBTI provides 16 subtypes; temperament provides broader categories.

Can you be an ISTJ with sanguine temperament?

Unlikely. ISTJ traits (structured, serious, stable) align more with melancholic or phlegmatic. Extreme outliers exist, but MBTI preferences and temperament usually align. Inconsistency suggests mistyping or defensive masking.

Which offers more insight: temperament or MBTI?

Different angles. Temperament reveals innate behavioral predispositions. MBTI reveals cognitive preferences and information processing. Both together create rich understanding. Choice depends on what you're trying to understand.