Actors’ Game, Properties, and Dynamics of a “Complex Action System” : International relationships in Europe and the Outbreak of the Second World War 
The systemic perspective doesn’t lead to oppose a structural or systemic conception to a more strategic approach. But on the contrary to relate them closely showing the interactions, the constraints and the interdependences which condition the different political choices, confine and progressively close the fields of possibilities. Much more than actor’s intentions, these are the system’s properties which determine its logic, its global dynamic and its effects. In this way we will successively look after the strategies of different national actors (Germany, France, Great-Britain, USSR, Belgium) in the triggering of the World War II, and the properties of the system related to the interactions and interdependences of actor’s games. Finally, we will study the dynamic and effects of the system: the path of war.