This book covers all the elements of Game Theory, emphasizing intuition over mathematical formalism. The philosophical aspects are also given a thorough treatment. The 8 appendices provide a more formal exposition of several key concepts such as the Minmax Theorem, the geometry of equilibria and Linear programming. The book has not changed much since its publication in 1957, but it is by no means archaic. Even for those who have a modern and more rigorous textbook, "Games and Decisions" is Highly recommended as a supplement. There is something for everyone in it.
This overview of game theory and decisions is a great into the problems and ideas behind game theory. I expect that this book will be most appreciated by non-math Ph.D.'s or grad students. For a math person, Von Neumann and Morgenstern's classic title is perhaps a better place to start. This book is one of those that can be read on a range of levels. I work in a trading and risk management environment and I find this book very useful.