This comprehensive textbook communicates the complexities of abnormal psychology, speaks to the concerns of students, and empathically portrays the real human impact of psychological disorders. For the ninth edition, award-winning teacher Ronald Comer is joined by Jonathan Comer, who brings his expertise in developmental psychopathology research, brain circuitry, cognitive-behavioural research, and technology-driven treatment. With its signature integrated coverage of theory, diagnosis, and treatment, and inclusive cross-cultural perspective, this new edition is an engaging introduction to where the study and treatment of psychological disorders stands today.