A lot can take place in a four-hour class. Essentially, the teacher aims to help students develop certain topics: he or she introduces concepts, presents certain notions that are developed in the literature, explains them, clarifies student's concerns, promotes new ideas, responds and asks questions, refers to notions addressed in previous classes, etc. From the start, the teacher is always aware of the key concepts that make up the subject of the study. By contrast, an important part of student learning is to rebuild the topics of the class, a process that involves making inferences, generalizations, and the establishment of a hierarchy between the notions being worked. The writing I propose focuses on this kind of activities.