Attribution theory was first introduced by Fitz Heider as a method to evaluate how individuals perceive their behavior and that of other people. In The Psychology of Interpersonal Relations (1958), for example, Heider states that human behavior is determined by either internal or external factors, which means that We tend to attribute the successes of others and our own failures to external factors … [while also tending] to attribute our own successes and failures of others to internal factors (12Manage.com, 2008). This concept, furthermore, has remained a fundamental element in current contribution theory. Nevertheless, other researchers have advanced Heider’s theory by developing theories models such as Correspondence Inference Theory and the Covariation Model, while researchers, such as Kelley (1967) have identified further elements. These factors, therefore, contribute the most to current understanding of how human beings explain the causes of their own and other people’s behavior.