Myers–Briggs Type Indicator

The MBTI is a self-report questionnaire that categorizes people into 16 personality types using four dichotomies: introversion/extraversion, sensing/intuition, thinking/feeling, and judging/perceiving. Despite widespread use in businesses and schools, it is widely regarded as pseudoscience by the scientific community. Criticisms include poor validity, low test-retest reliability (around 50% get different results retaking in five weeks), lack of independent research (much is funded by the publisher), and failure to show predictive power for job performance or satisfaction. The test relies on the Barnum effect and has no evidence behind its type dynamics theory. The original developers, Katharine Briggs and Isabel Myers, were not trained psychologists but self-taught. The test was first used to help women entering WWII workforce. Today it remains popular in South Korea and China for dating and hiring despite warnings against misuse.