A clear structure, simple and accurate. Organized by themes, it is read as one wants side student or teacher, depending on what concerns us and concerns us: error, difficulty, skills, authority, evaluation ... After a quick rundown on the state of research , the author offers us a few excerpts with possibly meaningful correlates that can bounce off other concepts. Thus, we have a few pages of the main ideas defended by the greatest teachers with the ability to pick up when the source is really packed! This is the green guide of the teacher and / or parent.