The topic of this article-based dissertation is the definition of user experience in user centred design. In particular, the work discusses user experiences in social interaction. To provide a framework for understanding these experiences, the concept co-experience borrows from symbolic interactionism, a theory of meaning in social interaction. The work in general follows a pragmatist philosophy. The cases in the study include one large field study on mobile multimedia messaging, one smaller field study of a new product and examples from a few concept design cases. The dissertation consists of an introduction part and six published articles
