Abstract
The aim of the article is to interpret the recent evolution of coordination mechanisms governing subcontracting relations, particularly extension of the duration of the agreement between the two contracting parties. Using tools of analysis based on the theory of incentives, the author considers partnerships as the building of an « incentive System ». Two aspects of incentive are studied from this point of view : on the one hand, the contract, and on the other hand, the incentive to innovate. However, partnership does not alter the relationship of authority which is inherent in this type of inter-firm agreement.