Personality: characteristics that create a unique expression of thoughts, feelings and behavior: cognition = thoughts, affect = feelings. Definition: systematic collection of explanations that account for observations and future predictions. Psychodynamic: emphasizes internal forces arising from early childhood experiences: libido and internal force. Humanistic (phenomenological): emphasizes subjective experience and self- determination: emphasizes the complexity of human nature, an individual has a self concept and plays a role in discovering themselves. Learning/behaviorist: emphasizes effects of experience and reinforcement: social influences and conditioning. Trait (dispositional): emphasizes specific qualities that are stable across diverse setting: the big five: ocean (openness, conscientiousness, extraversion, Biological: emphasizes genetics and physiological processes: sides with nature in nature vs nurture debate. Evolutionary: emphasizes adaptive significance of personality characteristics: touches on natural selection adaptation of certain personality traits, find a mate and half children + long life = success.