Rationality means many different things, and is not a field of study. Not surprisingly, a "handbook" of rationality reads more like an eclectic set of dictionary entries. There are some fine authors represented in this collection, but I found the subjects I know idiosyncratic and perfunctory, the authors managing to to make exciting topics seem boring. The subject I know less well or not at all I found bland and superficial. In no sense are these chapters reviews of the their respective fields. Rather, they are relatively narrow essays on particular topics.