I do not set out to make pro. development.
The book disappointed me to a point:
It is clearly not for children alone. If you are an adult and have used the self-study materials, it's perfect. Children (well mine, who are neither geniuses nor beasts to eat hay) have not been able to manage the book and I understand them. Some BDS for a childish and zoup side is started by level. It is difficult, the presentation of the work (too small, and the binder tends to close) does not put the book down and discuss.
So you have an adult side to explain, motivate, challenge (and distort the damn binding as open book does not only on the table).
It is therefore of parents engaged in teaching (I am not a psychologist but the book seems to be written by computer than by pro. Childhood) to return it to the taste of children.
In short, if you are motivated (and without need for knowledge prog.) Will be perfect for you.
If you rely on the book to put the children in front of the PC and that you do not care about peace, A: ca not work, Two, if you leave them and if they are silent is that they have spun on games on the web!