Psychological disorders are patterns of behavioural or psychological symptoms that impact multiple areas of life which creates distress for the person experiencing these symptoms. The term psychopathology may also be used to denote behaviors or experiences which are indicative of mental illness, even if they do not constitute a formal diagnosis. In present book, 34 research papers are contributed by noted scholars of psychology which has been classified into five parts. The first part of this book has been devoted eight papers to psychopathological disorders and its application of therapeutic interventions. Second part includes nine papers which deals with the psychosocial disorders and interventions. Disorder and retardation is described in the third part and fourth part deals with quality of life, health and happiness. Last part of this book is devoted to Anxiety and Depression. Editor gratefully acknowledge the support rendered by the respective authors for their valuable contributions.