In interwar France, there was a growing sense that ‘organization’ was the solution to the nation’s perceived social, economic and political ills. This book examines the roots of this idea in the industrial rationalization movement and its manifestations in areas as diverse as domestic organization and economic planning. In doing so, it shows how experts in fields ranging from engineering to the biological sciences shaped visions of a rational socio-economic order from the 1920s to Vichy and beyond.