The text results from a new collaboration between sociologists and data processing specialists. It presents a work of formalization of the sociology of organized action which led to the development of a meta-model of this theory. This meta-model makes it possible to model concrete systems of action and to simulate their operation. Through the exposure of the theoretical results and their application to a simple case, we wish to show that this step is of theoretical and methodological interest for sociology. It makes it possible to specify sociological concepts initially expressed in natural language in order to be able to evaluate them in a quantitative way. It makes possible the simulation of organisational situations and thus opens the way with an exploration of the possible states of a concrete system of action. These elements constitute, from our point of view, an enrichment of the sociological practice.