Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This book is extremely difficult to understand.

Excellent teaching guides are easy to read and understand. They're fun and only heighten interest in learning. Programming in Modula-3:An Introduction in Programming with Style by Laszlo Boszormenyi and Carsten Weich is NO INTRODUCTION. They're explanations are difficult to follow. In addition, it fails to enlighten the reader. I would not recommend this book to a fellow student or programming hobbiest who's just looking to learn a little bit more about Modula-3. I'm disappointed there aren't more Modula-3 programming books.