Emotion is an important component in any evaluation of an artwork. Research into emotion is a growing field, and methods for evaluating emotions in artworks is an area where research is rapidly expanding. This chapter outlines the basic theories of emotion and develops an understanding of the state of the art in emotion evaluation for interactive digital art. The component process model of Scherer is discussed and then a number of examples of evaluation of emotion in interactive art are presented, including a closer look at video games as a form of interactive art.