TOTAL buys a large percentage of its complex development projects, in the form of studies, equipment deliveries and installation of structures. All these parts are structured as a contractual strategy, which is a key element of project execution performance. Due to the number of contracts defined and the complex environment of projects, this process involves a large number of actors, either internal or external to TOTAL. The risk is a lack of coordination between these interdependent actors, with suboptimal decisions depending on local interests, notably due to contractual relationships between them. The objective of this paper is to propose a new approach to improve collaboration between interdependent actors so they can make more coordinated decisions. To do so, specific actors of the project are highlighted and grouped together, using an Actor/Actor matrix model and a clustering approach which takes into account the static and dynamic aspects of the relationships between actors.