Aspects of a system that affect the user's emotional state; that is creating a (usually) positive experience of using the system.
Also used in hcistats2e: Chap. 3: page 34; Chap. 8: page 88; Chap. 13: page 163
Also used in hcistats2e: Chap. 3: page 34; Chap. 8: page 88; Chap. 13: page 163