Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Superficial and useless analysis

John C. Beck, Mitchell E. Wade clearly do not know and understand the critical factors and strategy behind Ntt DoCoMo's i-mode. Most of the book is so superficial and general to be useless. Most of the intereting elements of Ntt DoCoMo strategy are not covered here so buy something else instead of wasting your money on this.