Unlike conventional attribution theories, the two-step process of attribution suggests that people analyze others' behaviors first by automatically making an internal attribution and only then considering possible external attributions that may affect the initial inference. Heider's most valuable contribution to the topic of attribution is the dichotomy: When attempting to decide why individuals behave a certain way, we can make either an internal or external attribution. Internal attribution, (also called dispositional attribution or personal attribution), is the assumption that an individual is acting a certain way due to something about that individual, such as personality, character, or attitude. External attribution, also called situational attribution, is the inference that an individual is acting a certain way due to the situation he or she is in; the assumption is that most individuals would respond in the same way in that similar situation. Essentially, people first assume that a person's behavior is due to his or her personality, and then attempt to modify this attribution by also factoring in the person's situation.