<qa>  What is the primary primary school in Madison and Chicago?Engaging in health-risk behaviors such as tobacco and alcohol use put youth at risk for health problems that may compromise their futures and are extremely costly to society. Positive parent-child communication, characterized by openness, satisfaction with the family, caring, and effective problem-solving, has been found to be protective against a youths involvement in health-risk behaviors. To promote positive adult-youth communication, in earlier work we developed, tested, and found efficacious an intervention, Mission Possible: Parents and Kids Who Listen MP. This study is designed to test the following hypotheses: a Adults and youth who participate in MP will demonstrate more positive communication when compared with adults who did not participate; b Youth who participate in MP will have a lower incidence of health-risk behavior when compared with youth who did not participate; and c Positive adult-youth communication will mediate childhood health-risk behavior in the presence of risk processes that predict participation. The experimental design is a 2-group intervention and comparison pre-test repeated measures design with six waves of data collection over three years and two booster sessions of the intervention. Elementary school and community centers in Madison and Chicago served as recruitment sites for parent-child dyads. 