On the other hand I crumpled by the question of money, because it must be said: to his school montessori child is very expensive and is reserved for an elite (in my city the montessori school for a section Native guy takes over 400 ... per month, registration fee ...), even if it is specified that the schools do not benefit from subsidies (except 3 or 4 me it seems), that 'we must train the teachers and the matèriel expensive, I would have liked a little more transparency about this.
Especially since even if the principle of education "on montessori" is very well explained and gives some keys, I do not find that this book (or others) is full of practical ideas to implement at home ... for that fortunately can count on a few blogs in French but especially in English that provide ideas for concrete and free learning.