Gilb's principles of software engineering management is a forerunner and influencial book to the agile software development revolution. When you read this you see all the parts that you recognise from elsewhere, plus learn how to measure your success using impact estimation tables. This book is all about incremental iteration and, even if you've read his newer comparative engineering book, you'll still find lots of useful details here, which are not in the other book. This book is delivered in a a more relaxed manner, and also covers a few useful aspects such as interfaces, and antecedents of the agile perspective in the literature, which is rather nice. Definately one you should pick up and read.