The Myers-Briggs Type Indicator (MBTI) and other personality tests like the Big Five and Enneagram are widely used but do not provide accurate insights into personality due to design flaws and changing definitions of traits, leading to inconsistent results. Personality traits are not stable over time and can be influenced by various factors, questioning the reliability of personality tests in predicting individual behavior.

Personality testing, a booming industry, lacks the ability to reveal true personality traits due to the subjective nature of self-reported metrics used in popular tests like MBTI, Big Five, DISC, Process Communication Model, and Enneagram. The construction of these tests, each focusing on different metrics, raises doubts about the stability and measurability of personality as a defining feature of individuals.

Personality tests like the Myers-Briggs Type Indicator (MBTI) can be inconsistent due to design flaws, with individuals often changing their assigned type upon retesting. The definitions of personality traits have evolved over time, highlighting the limitations of rigid categorizations.