Areas of expertise and advancements long recognized within the field of sport psychology have recently gained recognition for improving performance outside the realm of sport, in areas such as the performing arts, the armed services, and even enhancing ones overall health and quality of life. The textbook uses a life development intervention model designed help students and current practitioners alike sharpen the skills needed to help clients enhance their performance. Applicable for use in a one-on-one setting with clients, or in a class, workshop, professional development or training program, this textbook provides a conceptual overview and framework for teaching, applying, and evaluating this new intervention model that emphasizes positive development. When used together, this two volume set -- textbook and workbook -- serves as a valuable resource that pairs the concepts and tools with activities and practical application appropriate for use across disciplines, age groups and demographics in a variety of fields, from physical and mental health therapists, life coaches, and sport psychologists, to undergraduate and graduate students in these and related fields of study.