Readers should be aware that this book does not delve into detailed statistical tools that improvement teams use. Rather, the book focuses on leadership aspects so I would recommend another book like one of Breyfogle's for people interested in "hard tools" of Six Sigma.
This book, written for leaders, provides a succinct array of principles, general approach templates, and common traps for each stage of an improvement process. Rather than advocating detailed, sequential steps to take, the book offers up proven best practices and a general flow that leaders may, or may not apply based on their specific organizational circumstances. Another book I highly recommend that offers alternative approaches to improvement is Peter Pande's book What Is Six Sigma? A fixed, rigid improvement approach that is not customized to accommodate an organization's unique characteristics is doomed to expensive failure, and these two books get that concept.