For François Dupuy, change is a fact of life, one account how we will go about to achieve it with the least damage possible. This book shows the interest of real dune development methodology for changing organizations, especially in the public sector. This is all the more dactualité that globalization puts the user at the heart of customer concerns. Dupuy also speaks of the customer win, one must really give the contemporary world. Thus, this approach is consistent with the reform required the administration public. Dupuy lingers longer on the functioning of the bureaucracy, with its segmentation and formalization of tasks, fear of face-to-face, his routine set in regulations that serve mainly the comfort of one who executes them. It poses a merciless diagnosis, the bureaucracy is designed to eventually disappear. This study also situates the employee as quacteur including the organization of the public service, with dun creative potential and personal development. Sinspirant the work of Michel Crozier and Erhard Friedberg, especially the actor and the system constraints of collective action, the author postulates that the actor is rational, but under limited rationality dune inside concrete action systems . So it can change its behavior to influence organizational change. Bring about change requires dentrer relate to others: discuss, cooperate, share. The quality of communication becomes a basic requirement. Ideas away all made on the planned change from above, dear to the French authorities, we have here the design of a change negotiated between stakeholders.