Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A great practical guide to needs analysis from two masters

It was a joy to find a book that blends theory and practice as well as this one does. It is clearly written from a wealth of professional experience -- stories and examples illustrate almost every important point. The blend of theory and practical advice is just right. The writing style is clear and direct, setting a nice tone for the practitioners (or those just learning) that the book addresses. Hats off to Hackos and Redish.