This is a must read book for those who want to apply measurement to their software processes. It is in fact a book about statistical process control with a good introduction to all the charts and tests you can do, with a software flavour. Selecting the metrics to be used is very important and multiple examples are given in the book. An interesting companion is you decide to deploy a metrics programme in a software oriented organization (mandatory if you are using tools like CMM and you want to reach level 3 and 4..., or if you want to implement the measurements part in CMM-I)
All in: an accessible and highly recommended book.