The National Survey of Parents and Youth, conducted in seven discrete waves from
September 1999 through June 2003 served as the primary data collection tool. The survey
collected initial and two rounds of follow-up data from national representative samples of youth
between 9 and 18 years of age (8,000 individuals) and their parents (5,500 individuals) in their
homes using touch-screen laptop computers to mitigate privacy concerns associated with the
sensitive nature of the questions. Evaluators measured both general exposure to anti-drug
information and specific exposure to campaign messages.