Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Lacks substance

I have to agree with the last reviewer, that this book is a bit of a disappointment. Perhaps that is due more to my expectations of the book than the actual content. What I was looking for was concrete techniques to assist in raising children bilingually, with information backed up by research from the field. There is a large amount of research on the topic of bilingualism, and it would be nice to find it summarized in a single volume. However, this is a series of excerpts taken from various parents in bilingual situations together with reasonably obvious statements, with little relation to linguistic research. While the various opinions from parents were interesting, this could be found online at a bilingual forum. The rest, you will probably already know by instinct.