Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Very good introduction to what an EA is all about

Definitely a book to read to understand what an Enterprise architecture is and how to develop one. The book provides a step-based approach to get you to the point where a company can define its EA and how to evolve it. If you are looking for technical details you are in the wrong place. But if rather you want to understand the business benefits, then I doubt you'll find something easier to read on this subject.