This document defines personality and discusses its major determinants like heredity and environment. It also describes several personality assessment tools - the MBTI preferences, Big Five personality traits, locus of control, self-efficacy, self-esteem, self-monitoring, and PANAS. Personality influences individual behavior and characteristics that are relatively stable. The MBTI and Big Five frameworks identify preferences and traits related to how people gather information, make decisions, interact with others and the world. Other sections cover sources of self-efficacy, relationships between self-esteem and success/failure, and differences between high and low self-monitors.