This document provides an overview of personality and values as major influences on behavior. It discusses several personality frameworks including the Myers-Briggs Type Indicator and the Big Five model. The Myers-Briggs categorizes personalities into 16 types based on four scales, while the Big Five identifies five broad personality traits: extraversion, agreeableness, conscientiousness, neuroticism, and openness. The document also examines how personality traits predict workplace behaviors and performance. Finally, it introduces the "Dark Triad" of socially undesirable traits - Machiavellianism, narcissism, and psychopathy - and their implications.