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Abstract
This paper aims at providing an analytical model of the environmental regulations of agriculture. These firstly can be distinguished according the object, the underlying meaning of environment, the incentives, the scale and mode of implementation. But some case-studies show that regulation have to solve technical/scientific uncertainties and economic/social ones as well: this can only be done by mobilizing and coordinating hererogeneous elements. Considering these processes a new typology of institutional settings is drawn up. It emphasizes the double constraint of any regulation : it has to fit in the logic of one institutional setting and has to be developed within a communicational process that gives credibility and reliability to each involved actor.