For a Socio-legal Approach to the Production of Norms in the Field of Work Relations. There is a lack of conceptual clarity in the field of the production of norms because jurists, economists, sociologists, historians all have a different approach to the question. Lawyers tend to defend a monistic conception of the creation of rules, while sociologists and economists are inclined to adopt a pluralist concept of legal phenomena by including the notions of business customs and practices. Arguing for an interdisciplinary approach to norms production, the author shows, through comparative analysis of French and American collective bargaining Systems, that normative Systems are social constructs. The author stresses that the current crisis of normative Systems is not simply the consequence of the proliferation of regulations but also an indi cation of the failure of a rational, formalist, hierarchical model of norms production.