Book excerpt: This book summarizes scientific advances in our understanding of the interrelationship between obsessive-compulsive symptoms and schizophrenia and reflects on the implications for future research directions. In addition, guidelines are provided on practical assessment, diagnosis and treatment interventions, covering both pharmacotherapy and psychotherapy. The book acknowledges the need for a perspective that recognizes heterogeneous subgroups and diverse neurobiological explanations; accordingly, multidimensional research-based conceptual frameworks are provided that incorporate recent epidemiological, neurocognitive, neurogenetic and pharmacodynamic findings. Obsessive-Compulsive Symptoms in Schizophrenia has been written by an international team of experts who offer insights gained through their extensive experience. It will be an invaluable guide to this frequent and clinically important comorbidity and will be particularly useful for mental health practitioners.