I'm happy with my purchase. The book is concrete enough, I'm glad I could find concrete activities as the means to reach mobile. But it is a pity that there have activities that are not really. Finally, there are about 20 good ideas and activities but the rest is quite "useless" when we already know a little pedagogy as "let the pieces ... explore." So do not advise those who want discover the pedagogy because it is concretal but says very superficilement the good of a particular activity. And does not advise either professionals because there is a risk of boredom ...