Instruct: Classify Amazon reviews into positive or negative sentiment
Query: informative

In response to the other review: Actually, the author is an American social psychologist, and she didn't just "sit back and watch" her kids in Japanese public schools. She did in-depth research of the school systems, which involved multiple trips to Japan (her kids were not primarily schooled in Japanese) and a huge amount of observation, study, and interviewing. I would have given this book 5 stars except that I didn't want to appear to be biased in my aunt's favor!