This chapter focuses on how problem solving appraisal has been empirically demonstrated to be an important asset in living and an important component of positive psychology. It begins with a history of applied problem- solving appraisal, followed by how it is measured by the widely used Problem Solving Inventory (PSI). The PSI literature is reviewed, and demonstrates robust empirical evidence for the positive role of problem solving appraisal, linked to numerous indices of psychological adjustment, physical health, coping activities, and career/vocational adjustment. Future research can now more fully integrate problem solving appraisal with other positive psychology constructs, such as resilience, optimism, aging well, hope, and wisdom. Because problem solving appraisal is learned and malleable, this brings positive changes to people’s lives through the integration of problem solving and positive psychology.