This special theme issue includes: "Perspectives on Work" (Supiot); "Work and Usefulness to the World" (Castel); "Work and Identity in India" (Heuze-Brigant); "New Perspectives on Work as Value" (Meda); "Decline and Resurgence of Unremunerated Work" (Le Guidec); "Work and Public/Private Dichotomy" (Supiot); "Work and Training" (Favennec-Hery); "Post-industrial Society and Economic Security" (de Foucauld); "Towards a New Definition of the Employment Relationship"(Muckenberger). (SK)