I discuss Wolfgang Tress’ attempt to apply analytic philosophy to the field of psychiatry and psychological medicine. According to Tress the concept of a person as a rational intentional system is fundamental for psychological medicine and irreducible to concepts of the natural sciences. But the rationality assumptions that are crucial for the concept of a person need much more clarification than Tress provides. Furthermore, Tress’ concept of schizophrenia as a disorder of ‘semantic coherence of the person’ is seriously flawed empirically. (...) Pragmatics rather than semantics should provide the methodological framework for the reconstruction of psychopathological concepts, such as “schizophrenia” and “delusion”. (shrink)