Lay persons usually understand that the personality has consistency and causality. They also have the knowledge of what contents the personality consists of. Research of "theories of mind," which focuses on the developmental processes of the naive understanding of mind, suggests three stages : (a) alignment of actions (imitation) fosters the foundation of social cognition in young children (i.e., understanding that the mind causes behaviors, grasping the identity of a person, and discovering others' intentionality) ; (b) understanding of emotions helps young children learn causality and evaluative dimensions of behaviors ; and (c) older children and adults understand the consistency of personality and the evaluative dimensions of personality based on Big Five.