Humans are motivated to assign causes to the behavior of themselves and others. In social psychology, attribution is the process by which individuals explain the causes of behavior and events. Attribution theory is the study of models to explain those processes. Psychological research into attribution began with the work of Fritz Heider in the early part of the 20th century, subsequently developed by others such as Harold Kelley and Bernard Weiner.
Gestalt psychologist Fritz Heider is often described as the "father of attribution theory", during the early years of the 20th century.
In his 1920s dissertation, Heider addressed the problem of phenomenology: why do perceivers attribute the properties such as color to perceived objects, when those properties are mental constructs? Heider's answer that perceivers attribute that which they "directly" sense – vibrations in the air for instance – to an object they construe as causing those sense data. "Perceivers faced with sensory data thus see the perceptual object as 'out there', because they attribute the sensory data to their underlying causes in the world."
Heider extended this idea to attributions about people: "motives, intentions, sentiments ... the core processes which manifest themselves in overt behavior".
External attribution, also called situational attribution, refers to interpreting someone's behavior as being caused by the situation that the individual is in. For example, if Jacob's car tire is punctured he may attribute that to a hole in the road; by making attributions to the poor condition of the highway, he can make sense of the event without any discomfort that it may in reality have been the result of his bad driving.
Sometimes, when one's action or motives for the action are questioned, one has to give reasons. Internal attributions happen when the causes of the events involve two or more individuals. Account for your behavior using empirical data to validate your actions to people.
From the book The Psychology of Interpersonal Relations (1958), Fritz Heider tried to explore the nature of interpersonal relationship, and espoused the concept of what he called "common sense" or "naïve psychology". In his theory, he believed that people observe, analyze, and explain behaviors with explanations. Although people have different kinds of explanations for the events of human behaviors, Heider found it is very useful to group explanation into two categories; Internal (personal) and external (situational) attributions. When an internal attribution is made, the cause of the given behavior is assigned to the individual's characteristics such as ability, personality, mood, efforts, attitudes, or disposition. When an external attribution is made, the cause of the given behavior is assigned to the situation in which the behavior was seen such as the task, other people, or luck (that the individual producing the behavior did so because of the surrounding environment or the social situation). These two types lead to very different perceptions of the individual engaging in a behavior.