Studies in the strategy and tactics of competitive advantage Book

Ghemawat does an amazing work of summarizing this broad range of topics in this handful book. It is very useful for managers who are thinkers of it's organizations. Meaning that they care about the broader picture of what they are dealing with. And, of course, for leaders, boards and directors of organizations.
As any summary of this kind, though, it fails to provide some more depth in certain issues, and more outside research is needed. That is not the problem, though. Them problem is, for me, that some topics can become a little unclear in its briefness (as was chapter 4).