Very practical book, but the title is a misnomer. Although the examples and vignettes in the book take place in a school setting, this book is adaptable and fully transferable to any supervisor in any workplace setting. I enjoyed Chapters 3 (Committed Listening) & 4 (Powerful Speaking) the most. Committed Listening is the application of the Stephen Covey principle of seeking first to understand and then to be understood, and thus, if practiced, would prevent many misunderstandings early in the process before they have opportunity to become major problems.
Committed Listening provides "opportunities for building trust with others and creates space for new solutions" (solutions you otherwise would have forfeited even being introduced to).
Powerful Speaking will remind you of the best things you liked about the best boss you ever had, because it fosters respect and invites others to actively participate in pursuing a solution. To borrow from Stephen Covey again, it gives you the best chance to enjoy a win-win scenario. This book teaches you how and when to ask which questions.