Practice books are often simple 'how to' lists or straightforward 'recipes' and the practitioner still does not know why the activity is related to the outcome they seek. In essence, they lose how the specifics of the practice are related to the theory of change or the theory of how the problem developed in the first place. This leads to practitioners potentially removing crucial elements of best practice procedures when making modifications to tackle new or different problems in an unfamiliar context. By understanding the theoretical underpinnings, practitioners can better plan for adjustments because they know how the outcomes they seek are informed by the theory. Engagingly written and perfect for day-to-day use, this book translates state-of-the-art research and interdisciplinary theory into practical recommendations for those working with children and adolescents.