The technical function of a knowledge dynamical management system (KDMS) is to manage and control the evolution of the knowledge corpus produced by an organization in the framework of project. Based on the KDMS, this paper explains how to design collective evaluation aids and traceability functions for strategic decisions and logical argumentation. The management of a collective project is thus represented as a control loop where the risk accompanying the decisions is the controlled variable and is strongly linked to the entropy of the knowledge base managed by the KDMS. Each of the three phases—Intelligence, Design, Choice—of the DM process is identified to a function of the control loop: actuator, regulator and process.