This conclusion presents an overview of key concepts discussed in the preceding chapter of this book. The book examines the nature of mental illness and concludes that the antipsychiatrists are mistaken, and that mental illness is no myth. It focuses on natural-history style explanations. These explanations work by identifying the natural kind to which an individual belongs. It focuses on the use of individual case histories. This book argues that psychiatry is a multi-paradigm science. Kuhn claimed that communication between paradigms is problematic, but it suggested that in practice communication problems can be overcome via the construction of contact languages and through shared direct contact with patients. The book looks at reductionism within psychiatry. It examines the ways in which psychiatry is a value-laden science and argued that psychiatry is affected by values at every stage of enquiry. The book focuses on the use of Randomized controlled Trial (RCT), to evaluate psychiatric treatments.