Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Readable and Understandable

This is a book that I recommend to all of the software developers I work with, it is so much more than the gang of 4, it is actually readable. The unique format used to address the topics helps with retention and understandability. The only complaint that I would have about the book, and the reason I gave it 4 stars, is that the examples used are impractical and sometimes silly. The authors also could have alluded more to the usages of algorithms and efficiency of code.