This volume gives a state-of-the-art overview of assessment in the field of positive psychology, including a comprehensive survey of current theories, approaches, issues, and assessment instruments. In four sections, leading experts look at different conceptualizations of well-being and discuss specific traits, states, and behaviors. New directions in positive psychology are also explored, including measuring primal world beliefs, imagination, self-transcendent experiences, and nostalgia. Each chapter provides an introductory background to the positive psychology topic reviews the most relevant assessment instruments, and discusses the specific assessment-related challenges. Recommendations for selecting assessment tools are included for specific settings, such as school, relationships, health and clinical settings, leisure, and interventions.