As in "Nurtured by love", some of the life philosophy sounds a bit out of place: "act quickly on what you think", while an excellent advice, should have been tied in with the rest of the book. The same goes for other maxims, such as "do not cheat yourself". Both "Nurtured by Love" and "Ability Development" suffer from the lack of directed studies and critical analysis of much that Suzuki postulates. Intuitively though, his theories sound very appealing, while the great optimism and love for children shine through the imperfections of the books.
The book reads like a somewhat watered-down version of "Nurtured by Love", which I would recommend instead of this one.