Internationally respected authors, actively working in this area, establish theoretical reasons for extending cognitive therapy to these symptoms. This includes a justification for looking at symptoms rather than syndromes, first-person accounts of delusions and hallucinations along with an analysis of why the cognitive approach is ideally suited to the study and treatment of these disabling disorders. Describes how to make a cognitive assessment of both hallucinations and delusions and which measures to use. Contains new research and methods of managing these severe psychoses.