'Tsou's deep fluency with philosophy of science will make his contribution particularly useful for philosophers familiar with central themes in that field, such as natural kinds, realism, and causation, who want to learn about the application of these themes in a medical context.' Kathryn Tabb, Metascience
1. Introduction; 2. Skepticism about Biological Psychiatry; 3. Defining Mental Disorder; 4. Natural Kinds in Psychiatry; 5. Psychiatric Classification and the Pursuit of Diagnostic Validity; 6. Conclusion.