If you want to change something and there's more than a few people involved this is one of the books you ought to have read. The author helped with/ watched a lot of changes in big organizations and wrote his experience down here. Neatly categorized in an 8 step process which he is convinced you need to go through when you implement a change.

I have no clue whether that 8 step approach is the only valid way to go through a change - and I didn't find any compelling evidence in the book either. A lot of what he writes makes sense, though. Like: create (real) early successes and keep em coming to get the ball rolling. Do the cultural shizzle last - it's not going to change anyhow if there's not some hard evidence that working differently actually works.

Another reason to read this is that it's considered a classic, which means that a lot of people you're working with when changing things will have read it. And a common vocabulary/ reference is handy in those situations.