This paper presents ISiS model (Intentions, Strategies, interactional Situations), a conceptual framework elaborated to structure the design of learning scenarios by teachers-designers and to favour sharing and reuse practices. The framework is based on an intention-oriented approach and proposes to identify intentional, strategic, tactical and operational dimensions in a learning scenario. This paper gives an overview of research context, presents the model and how it has been elaborated in collaboration with teachers.