School is concerned with knowledge transmission which all does not refer to erudite knowledge made up, like those of mathematics, for instance. It is thus of information search on Internet which takes a place growing in many social practices. From this point of view, a teaching of the information search was introduced into the french syllabus of technology for pupils of 4th french school level. The thesis concerns examination of the question of the knowledge transmission and organisation of the form of transmission-appropriation of this new teaching object. The information consultation take its roots in human activity which organise around use, and thus of instrumentalisation of a tool. We know the weakness of the learnings based on the only operational control. To examine the stakes of the didactic transposition starting from practices, supposes to be extracted of an exclusively procedural approach. First of all, we have focused on thus for the question of working out expert knowledge by supporting us about the instrumental genesis and based in practices analyses. In the second time, we were interested in the process of teaching-learning. Pupils observation enabled us, through their designs, to measure the distance which separates their practice from information consultation of that experts and thus to qualify the stakes of learning. The analyse of the work of the teachers allows us to identify the form of transmission which use for this teaching and thus anticipate on the probable pupils difficulties. Thus, the crossing of these analyses enables us to qualify the process of transmission-appropriation about a particular corpus of knowledge related to the information consultation on Internet and, with final, to think of the assistances of the teachers work from the didactic engineering point of view.
