The APA Dictionary of Psychology entry on the Myers–Briggs Type Indicator (MBTI) explicitly notes it has “little credibility among research psychologists.” That’s a direct, authoritative summary of how the instrument is regarded in mainstream research settings, distinct from marketing claims made by the test’s commercial publisher.
One key reason is measurement stability: a 2025 systematic review in the International Journal of Social Science Research reported inconsistent test–retest reliability, with about 50% of participants receiving a different MBTI “type” on retesting. While some studies report acceptable reliability/validity indices for certain subscales (e.g., research summarized in PubMed Central), the strongest criticisms focus on the forced binary “type” categorization and weak predictive validity—issues that undercut the MBTI’s scientific credibility as a personality assessment.