 It should be noted that appraisal theories do not properly qualify as theories of what emotions are, even though individual appraisal theorists often articulate such theories as a complement to their theories of the structure of appraisal. More specifically, appraisal theories are in principle compatible with theories of emotions that identify them as evaluations, feelings, or motivations, as long as such theories acknowledge that appraisals play an essential role in differentiating emotions from one another. This being said, a great many influential appraisal theorists—including Arnold, Lazarus and Scherer—offer theories of emotions that would best fit into the Motivational Tradition.