Appraisal theory has become one of the most active aproaches in the domain of emotion psychology. The appraisal process consists of the subjective evaluation that occurs during the individual's encounter with significant events in the environment, thus determining the nature of the emotional reaction and experience. The organism's interpretation of events and situations elicits and differentiates its emotional responses, although the exact processes involved and the limits of the theory are still a matter of debate and are currently the object of active research. This volume is intended to become the primary source of information on appraisal for all those interested in emotion, from beginning graduate students to accomplished researchers in emotion psychology.