This book is written for people who work at companies that have an IT department to support their non-IT business, with may installed systems, a large backlog of IT changes, a number of projects in progress right now with unlikely target dates, IT staff who overworked and not too happy... you get the point.
This does not have to be the case. "Cascade" shows you how to get out of the current mess and move your company's IT function to a well-managed, productive service, summarized in 13 "Better Practices".