Christian Morel made a sociological analysis of the systems we create, consciously or - most often - unconsciously, of which we become prisoners to the point of taking "absurd decisions". The book is well done because it combines case studies of decision-making processes that lead to disaster, a scientific analysis which uses the work of Herbert Simon Administration and decision process and the limited rationality found in indispensable the artificial sciences. Confinement in a system leads to prefer the actor belonging to the system and compliance with the relevant decision that his only rationality (even limited) could enable it to take. To get out of this confinement must be an actor who brings the system to think himself out of his confinement. Morel is of course referring to the study Graham Allison Essence of Decision: Explaining the Cuban Missile Crisis, unfortunately not translated into French. To get out of these "apparently normal absurd decisions" must be combined with decentralization of decision centralization of common sense, reference each obtained by socialization and belonging to an epistemological community. It combines the advantages of the decentralized system and those of our good old centralization. Very well referenced, very serious and easy to read.