Attribution theory explains how people make causal explanations for behaviors. It was introduced by Fritz Heider in 1958 and examines how people attribute causes to their own and others' behaviors as either internal/personal factors or external/situational factors. There are some common attribution errors like self-serving bias, where people attribute successes to themselves but failures to outside factors, and the fundamental attribution error, where we tend to attribute others' behaviors more to internal causes rather than external situational factors. Keeping attribution theory in mind, people should consider both internal and external factors and not make rushed judgments of others.