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In page Bernard Weiner:

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Attribution theory seeks to explain the causes of an event or behavior. A three stages process, they are observations, determination of behavior, and attributing to causes. There are two types of attributions, namely external and internal. External attribution relates causality to outside agents, whereas, internal attribution assigns the person himself for any behavior. In an 1996 interview, Weiner elaborated how attribution contributes to "high ability, high achievement, and giftedness", stating that "other-perception and self-perception form a unity, together, which influence task persistence and, therefore, actual ability."[1]