The survey was conducted in four annual waves from 1987-90 and collected information from approximately 6,000 to 8,000 participants each year in shopping malls and college campuses. The baseline wave was completed in 1987 before the Partnership advertising began. The fourth wave included significant oversamples of blacks and Hispanics. Prospective participants were approached and screened according to quotas based on age, race, and sex and then asked to participate by completing a self-administered questionnaire. Results suggested that attitudes toward the use of illegal drugs are becoming increasingly antagonistic. In addition, friendship networks are narrowing to exclude drug users; more individual report having no friends who use marijuana and cocaine. Moreover, illegal drug use has decreased, especially among teenagers. Tables