Mathematics textbooks and teaching activity

This article focuses on the relations between the activity of the teachers and the contents of textbooks and the teacher's manuals. Through the observation of lessons, we analyse and discuss how the teachers follow the recommendations written by the authors of teacher's manuals. We describe the adjustments made by these teachers, comparing them to the recommendations written by the authors of teacher's manuals. The observations lead us to point out some didactic obstacles and to mention the major role of an epistemological and didactic teacher training.