According to Lazarus (1991), theories of emotion involve a relational aspect, a motivational aspect, and a cognitive aspect (Lazarus, 1991). The relational aspect involves the relationship between a person and the environment and suggests that emotions always involve an interaction between the two (Lazarus, 1991). The motivational aspect involves an assessment of the status of one's goals and is the aspect of the evaluation of a situation in which a person determines how relevant the situation is to his or her goals (Lazarus, 1991). Finally, the cognitive component involves one's appraisal of the situation, or an evaluation of how relevant and significant a situation is to one's life (Lazarus, 1991). Lazarus suggests that different emotions are elicited when situations are evaluated differently according to these three categories. In order to evaluate each emotion individually, however, a structural model of appraisal is necessary (Lazarus, 1991). This model allows for the individual components of the appraisal process to be determined for each emotion. In addition, this model allows for the evaluation of how and where the appraisal processes differ for different emotions (Lazarus, 1991).