This paper does a good job of pulling together ideas and present them is a simple manner. It is also refreshing to read an article where many sources are given credit and the author does not attempt to "sell" their unique ideas. Management improvement is mainly about using great ideas that have been around for years and decades.
Useful, innovative new management ideas are great. But far too much effort is placed in trying to package "systems" (or copyrighted terms) as some new breakthrough in management when most often they offer little of value. This article points to a number of very useful sources, in my opinion such as: The Leader's Handbook.