The book was written about software development projects, but is absolutely loaded with insight not just on that subject, but on management styles and workplace conditions and rules. One can read this book and become genuinely excited about the potential explosion of productivity, hand-in-hand with employee job satisfaction, that could occur if managers would simply follow the advice given by the authors on how to be effective workplace leaders.
Alas, it probably won't ever happen. Several years ago, the large (Fortune 20) company I worked for brought in Timothy Lister to present the book and the ideas in it to management prior to the start of a major software project. Lister did an excellent job presenting his and DeMarco's philosophy. The managers nodded sagely and showed every sign of comprehending and accepting the concepts contained in the book. Then Lister left, the project started, and the managers immediately reverted to the old style: setting unrealistic deadlines, pressuring employees to deliver more and more in less and less time, and in general following every tired old management strategy that almost always leads to a failed project -- as indeed, it did in this case.
So read this book, learn from it, and enjoy it (it's an easy, entertaining read) -- even if your managers are too stupid to profit from it.