It is seldom I give a workbook high ratings, but this is a well-deserved exception. Good checklists, with explanations that follow a logical and well thought out process (some of it of course due to Kotter's' book Leading Change which this should be read after, or you'll miss some details).

Anyway, if you're into change management (and who isn't?), you should definitely both buy this book, read it, and start using it!