In order to examine the full spectrum of human behavior it is essential to explore social behavior, behavior that involves interactions with other people. Social psychology, the subject matter of this chapter, is the systematic study of how exchanges with these others in our environment influence our thoughts, feelings, and actions. Interpersonal Attraction: Who Likes Whom, and Why? Interpersonal attraction exists between two people when they make, or wish to make, more approach responses than avoidance responses to each other. It should be noted that attraction is not necessarily interpersonal. It is interpersonal only if the attraction is mutual. First, physical appearance plays an important role in interpersonal attraction. Second, personality traits are a set of factors. It is sometimes said that opposites attract. Third, interests are sets of factors. Fourth, the matching hypothesis states that interpersonal attraction is fostered when two people ...