This paper constitute an exhaustive state of the art focused on the understanding of interaction design in user experience design. The topic and this ongoing research comes within a long term work on Kansei Design, Experience Design and now Interaction Design. The aim of this paper is to present a wide bibliographic basis on Experiential Interaction in order to compare, structure , highlight and propose a better understanding and a new definition of Interaction during early design phases. Through this state of the art, we suggest that different contexts of user experience imply different ways of integrating aspects of physical and digital interaction. Indeed, that parameters of interaction truly impact experiences that users are living with their artifacts. That is why this paper constitutes a global understanding of User Experience through a syntheti-cal model, encompassing definitions, models and authors presented hereafter.