While knowledge on substance abuse and addictions is expanding rapidly, clinical practice still lags behind. This book brings together leading experts to describe what treatment and prevention would look like if it were based on the best science available. The volume incorporates developmental, neurobiological, genetic, behavioral, and social-environmental perspectives. Tightly edited chapters summarize current thinking on the nature and causes of alcohol and other drug problems; discuss what works at the individual, family, and societal levels; and offer robust principles for developing more effective, humane treatments and services.