Firstly, I would like to say a massive thank you to my darling wife Jane who has yet again had to put up with a husband who for the past few months has done little more than spend every spare moment staring at a laptop screen typing things, frowning then typing more things—things which eventually turned into this book.

A big thank you to John Fisher for allowing me to again include his transition curve within the book.

Thank you to everyone who purchased and read the first two editions—without you the opportunity for this third edition would never have come to be.

Lastly I want to thank the global CD and DevOps community for their never ending commitment, passion, enthusiasm and evangelism to bring this amazing way of working to the masses. Keep up the good work.