In this book, The opening section provides an overview of different frameworks for conceptualizing primary prevention research related to issues of mental and emotional dysfunction. The second section provides criteria for conducting state of the art prevention research. Section three explores the significance of appropriate attention to risk factors in the conceptualization and design of prevention research. Section four presents four invention programmer targeted at various populations at risk for mental disorders and behavioral dysfunctions. In the section five author gives a basic introduction to the concept of necessity for statistical power in prevention research. Section six explores ethical considerations in the mounting of preventive trials an area of increasing important and needed attention...