This is a great resource for working with legacy systems. Actually, it is mostly about working with people, which is appropriate. Creating and using software is often about working with people and reifying workflow processes in software.

I had it recommended to me as a good book for non-legacy systems as well. There are some good points about when to modernize a system and avoiding chasing shiny new technology.

I didn't find it helpful to a software engineer such as myself, but I could see the value in a manager reading it, which is appropriate as Marianne is coming from an engineering management perspective.