As one who has little formal training in philosophy, but who has been practicing philosophy without a license (as do, surely, many respected colleagues who resort to the DSM codes primarily for reimbursement), I celebrate the birth of this book and wish it well. People in the field are all amateur philosophers, and they can use some professional help. The book would serve for a semester course in the last year of college and in graduate school. Every psychiatric residency and clinical psychology program should devote at least an annual grand rounds or case conference to this work. It should be required reading for anyone who has anything to do with the current use and the future development of the DSM.