In particular, there is a need for clarification regarding measurement of the many facets of emotion we identified earlier in this review, including but not limited to the specificity (generic positive and negative versus discrete), dimension (arousal versus unpleasantness), and expression, for instance. The first steps required to facilitate measurement of emotions must be to identify the dimensions of interest (e.g., valence, arousal), to state if the emotions measured are discrete or more generic, and to identify the rationale behind this.