Design and Use of Software Architectures

Amazon.com: Books: Design and Use of Software Architectures: "This book is certainly not for beginners. You already have to know a lot about software architecture to meaningfully read it.
It is very abstract, elegant and bright. The reading style is still amazingly light. If you are in the know you are delighted to read about it in such an elegant way. If you are not in the know you will have trouble to develop a concrete idea and to digest all those different aspects on so few pages. "

I view it as a philosophy on architecture design instead of a methodology.