Our reflection concerns the use of the survey as a tool for management and prevention of environmental, military, or territorial risks in Provence during the 13th and 14th centuries. Indeed, can we consider the survey as a virtuous tool to know and improve the realities faced by medieval societies? Thus, even if the absence of risk theorization in the medieval period seems obvious, we can question the development of a rationality - undoubtedly empirical - allowing the inclusion of risk management, or even prevention, in the discourse and acts of practice. Consequently, the writing of a standard investigation procedure would help to establish a framework for the exercise of risk management after a private conflict, or a demarcation issue, but also after a natural disaster such as the recurrent flooding on the banks of the Rhône. We also reflect that these surveys can be used to prevent a risk or to control its impact on the property rights through demarcation, with the writing of the usus of a location, able to generate long conflicts, as shown by the procedures referring to previous acts dealing with the same risk. The use of the database established during my thesis would help to identify recurrences in an explicit dimension to think about the use of the inquisitorial procedure as a tool for responding to a possible crisis or as a way of considering an already existing liability.