The Attribution theory describes the processes of explaining events and the behavioral and emotional consequences of those explanations.
It is about how people make causal explanations; about how they answer questions beginning with "why?" The theory deals with the information they use in making causal inferences, and with what they do with this information to answer causal questions. The theory developed within social psychology as a means of dealing with questions of social perception. For instance, if a person is aggressively competitive in his/her behavior, is s/he this kind of person, or is s/he reacting to situational pressures. If a person fails a test, does s/he have low ability, or is the test difficult? In both examples, the questions concern the causes of observed behavior and the answers of interest are those given by the man on the street. This is why Heider refers to attribution theory as "naïve" psychology. Moreover, it is a the theory of how people explain others' behavior; for example, by attributing it either to internal dispositions (enduring traits, motives, and attitudes) or to external situations. In general, an analysis of human motivation that stresses the impact of psychological or physiological needs or desires on individuals' thoughts, feelings, and actions; also an explanation of social facilitation proposed by Robert Zajonc, which maintains that the presence of others evokes a generalized drive state characterized by increased readiness