The study of user emotions is hindered by the absence of a clear overview of what positive emotions can be experienced in human-product interactions. Existing typologies are either too concise or too comprehensive, including less than five or hundreds of positive emotions, respectively. To overcome this hindrance, this paper introduces a basic set of 25 positive emotion types that represent the general repertoire of positive human emotions. The set was developed with a componential analysis of 150 positive emotion words. A questionnaire study that explored how and when each of the 25 emotions are experienced in human-product interactions resulted in a collection of 729 example cases. On the basis of these cases, six main sources of positive emotions in human-product interactions are proposed. By providing a fine-grained yet concise vocabulary of positive emotions that people can experience in response to product design, the typology aims to facilitate both research and design activities. The implications and limitations of the set are discussed, and some future research steps are proposed.

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Desmet, P. M. A. (2012). Faces of product pleasure: 25 positive emotions in human-product interactions. International Journal of Design, 6(2), 1-29.

 Desmet-2012-Faces of Product Pleasure- 25 Positive Emotions in  Human-Product Interactions