Presenting a fresh approach to child and adolescent therapy, this book identifies five principles at the heart of the most potent evidence-based treatments—and shows how to apply them. Clinicians learn efficient, engaging ways to teach the skills of Feeling Calm, Increasing Motivation, Repairing Thoughts, Solving Problems, and Trying the Opposite (FIRST) to 5- to 15-year-olds and their parents. FIRST principles can be used flexibly and strategically in treatment of problems including anxiety, posttraumatic stress, depression, and misconduct. In a convenient large-size format, the book features 37 reproducible parent handouts, decision trees, and other clinical tools. Purchasers get access to a companion website where they can download and print these materials, plus Spanish-language versions of selected parent handouts.