For what it is, this is a terrific book. However, this isn't a "quick read," done for pleasure. This is one of the best works on policy analysis around. And it does not "dumb down" for the reader.
The book begins with a simple example of policy analysis (including the use of the authors' template to select which policy or policies might be best). The remainder of the first part of the book focuses on the nature of policy analysis and professional ethics.
The second part is a critical portion of the book. It begins by noting the idealized market model. The authors go on to obvserve, though, that market failure can take place (they describe the various forms of market failure in depth) and then government intervention in the market becomes a realistic option. Of course, there can also be government failure, a concept discussed in depth.
Part III represents an examination of mechanisms available to correct both market and government failure (simulating markets, taxes and subsidies, insurance, etc.). Part IV provides tools for doing policy analysis. Part V considers some case studies as illustrations of policy analysis in action (e.g., the strategic petroleum reserve and revising the lead standard in gasoline). The final brief segment emphasizes the importance for the policy analyst of both doing well and doing good.
This is not an easy read, especially if you are not "up" on your command of economics. But it ends up being a very satisfying book, providing entree to the world of policy analysis. Indeed, I think highly enough of this volume that I have routinely used it as a textbook in the graduate classes in policy analysis that I have taught.