In psychology, the study of subjective wellbeing has given rise to the wide-spread and multifaceted movement of Positive Psychology, whose activities have originated from two basic perspectives. The hedonic perspective includes studies that mainly analyze pleasure, considered as purely individual wellbeing, related to positive sensations and emotions. The eudaimonic perspective focuses on the analysis of factors that favor the development and fulfilment of individual potentials and of authentic human nature. It derives from Aristotle's concept of eudaimonia, which takes into account what is useful to the individual, what enriches personality. Eudaimonia comprises individual satisfaction as well as development towards integration with the surrounding world. The term is often considered analogous to "happiness", but its semantic field is much wider: It implies an interaction process and mutual influence between individual and collective wellbeing, so that individual happiness takes place in the social space.