CESAM Agility is an agile model-based systems engineering framework, based both on real concrete applications & experiences in order to ensure practical applicability and on the CESAM model-based systems architecting framework (see [17] for more details). We already have defined the fundamentals of such a framework which, even if not fully formalized, was already used in several real development contexts in order to find quickly an optimal system that answers to all stakeholders’ needs...