Many governments, having large pain to balance their budget, note a strong disparity between their efforts in favour of education on the one hand and, on the other hand, the result of this effort, which can be measured by the proportion of well-trained pupils or by the general instruction level of the population. It is this observation which places the problem of the effectiveness of teaching at the center of the research tasks. It imports us here to see in what extent the objectives laid down for the education system are reached. With this intention, we will try to go further than the usual indicators, like the rates of success to the examinations or rates of completion, in order to apprehend better the effectiveness of the  education system.