Summarizes knowledge about the characteristics, knowledge, attitudes, and practices of certain audiences of children who are at a higher risk for drug and alcohol abuse. Also discusses channels, sources, materials and messages and offers ideas for reaching these groups. Chapters cover the general category of youth from high-risk environments, looking specifically at Black and Hispanic/Latino children, and influences on them such as parents and primary care physicians. Includes case studies, messages and materials review process, and intermediary organizations.