This workshop introduces a new approach for studying the ecology of teachers’ preparation and reflection on their didactic activities for teaching. A key idea of the approach is paradidactic reality, that is, a reality alongside “didactic” reality. In the same manner as with students’ and teachers’ actions in didactic situations, teachers’ behaviours for managing didactic situations are also affected by different kinds of conditions and constraints. This point of view leads us to a specialised scale of determinacy levels about paradidactic phenomena.