All procedures followed APA guidelines for the ethical conduct of research and were approved by the institutional review boards at each of the four sites. Each summer, two research interviewers visited each home; one interviewed the primary caregiver and the other interviewed the youth. The interviewer read through all questionnaires and recorded the caregiver’s response. Computer-assisted interviews were conducted with the youth, who wore headphones and listened to items being read to them on a laptop computer, answering directly. Each spring, rating forms were delivered and explained to teachers, who then completed them and returned them to the project. Parents, youth, and teachers were all compensated financially for their participation. Data collection staff were naïve concerning the normative, intervention, or control status of the families and youth they interviewed. Data were processed at a central data center that served all four sites.
