"This book was written to be an independent, impartial and objective study of the various agile methods (scrum, xp, lean, crystal) viewed against the knowledge-base of software engineering methods and principles. ... This book, in my view, should be essential reading for any software manager, looking to understand agile methods before diving head-first into a vanilla, textbook-implementations." (Outlet!, khanmjk-outlet.blogspot.de, November, 2015) "The purpose of this excellent book is to 'enable readers to benefit from the good ideas in agile methods and stay away from the bad ones.' ... The overall presentation is elegant, clear, and understandable ... . It can be used both by novices and by experts ... ." (H. I. Kilov, Computing Reviews, September, 2014)