T1: Expert

T2: Novice

―She responsabilizes her students progressively: proposes them open tasks, observes their behaviors and questions them on their work to analyze their own action.

―She listens to their intentions and delivers them a certain liberty to construct their knowledge.

―He deliberates himself from training responsibility by entrusting to tasks that he proposed to his students (Brousseau, 1996) .

―He cannot master the different issues of knowledge of some tasks. So that he bears all the teaching apprenticeship process.

―This delivered liberty towards her students and her listening to their intentions reveal the didactic relationship evolution.

―He has a little didactic interaction with his students, since he does not regulate and he accepts student answers as valid.