This "In Brief" edition provides highlights from the "Preventing Drug Use among Children and Adolescents: A Research-Based Guide for Parents, Educators, and Community Leaders, Second Edition." It presents the updated prevention principles, an overview of program planning, and critical first steps for those learning about prevention. Thus, this shortened edition can serve as an introduction to research-based prevention for those new to the field of drug abuse prevention. A list of selected resources is also included. [For "Preventing Drug Use among Children and Adolescents: A Research-Based Guide for Parents, Educators, and Community Leaders. Second Edition," see ED521530.]