Positive psychology is the scientific study of optimal human functioning. The history of psychology as a science shows that the field has been primarily dedicated to addressing mental illness rather than mental wellness. Its research programs and application models have dealt mainly with how people are impaired rather than how they thrive. Rather than detail mental illness and late interventions. This textbook aims to describe the scientific study of the psychology of people in good mental health.
Snyder, S.; Lopez (2006), Positive Psychology: The Scientific and Practical Explorations of Human Strengths, Sage Publications, Inc.