This book makes a pairing of sociology and psychology of work as the two fields deal with human behaviors in the context of professional activities.Indeed, the sociology of work questions the relationships that men and women weave in the workplace, based on the assumption that they are multiple, complex, and concern both working time and time outside work, the "inside" and the "outside" of the company, the workshop, the workplace.In addition, this book emphasizes theories from social psychology in group dynamics as the central pivot of organizations by taking into account friendships, influence, power, persuasion, leadership, conformity.Thus, the goal of psychological studies made it possible, according to Pierre Janet, to "bring together two individuals who think they are too easily opposed to each other: the team leader and the boss on the one hand, the employee and the worker on the other hand.