How do the social sciences address the question of innovation and the relationship between technology and use? This is the core point of this book which examines critically diverse works, in sociology, history, economics and anthropology, in order to formulate a new approach. This reflection is essentially of a general nature, though the cases used to illustrate the analysis are drawn primarily from the field of ICT. Patrice Flichy studies how the socio-technological actions of the different actors, particularly designers and users, are organized within the same frames of reference. He also introduces a new element into the model by demonstrating how time is involved in technological choices.