Actual collaborative RE processes cannot be only based on work analysis as a rigid sequence of procedures and decisions following the steps of a designer-centered methodology, because their dynamics are determined by choice, decision and participation of members of a multidisciplinary team. In fact, in most of actual RE process instances, a large variety of alternative actions and interactions can be combined for the accomplishment of goals. These alternatives are shaped by the context which constitutes the space of resources for acceptable RE strategies.