Traditionally, assessment and evaluation have focused on the negative aspects or deficits of a client’s presentation. Yet strengths, health, and those things that are going “right” in a person’s life are key protective factors in the prevention and treatment of many mental health problems. Thus, measuring strengths is an important component of a balanced assessment and evaluation process. This is the first compendium of more than 150 valid and reliable strengths-based assessment tools that clinicians, researchers, educators, and program evaluators can use to assess a wide array of positive attributes, including well-being, mindfulness, optimism, resilience, humor, aspirations, values, sources of support, emotional intelligence, and much more. These tools provide a clear picture of an individual’s strengths while being easy to complete, score, and interpret.