Abstract: User experience is a multi-dimensional cognition function which users form during their interaction with products. Investigating what shapes user experience can help researches improve user experience effectively. The influence of single factors, namely usability, aesthetics and emotions, were proven, but none of them are the only decisive factor of user experience. Recent research focuses on synergistic theories and multiple factors models. By reviewing Pragmatic & Hedonic Value theory, User-Product-Organization theory and four user experience building models, decisive factors shaping user experience can be determined. Areas needing further investigation are identified: deeper investigation of corresponding factors in the models, how user experience on social agents forms and how user experience changes over time.

Key words: user experience, social agents, aesthetics, usability, task context