Many school-based research efforts require active parental consent for student participation. Maximizing rates of consent form return and agreement is an important issue, because sample representativeness may be compromised when these rates are low. This article compares two methods for obtaining active parental consent: return of consent forms in the mail versus return by students to their classrooms. The methods were tested in a pilot study of 46 schools (1,058 students), with half of the schools randomly allocated to each of the alternative methods. A hierarchical nonlinear model of consent form return and agreement rates suggests that the student-delivered method is more successful at producing higher rates of consent form return and agreement to participate in the study, after controlling for school-level characteristics. The authors discuss the findings and their implications for other researchers engaged in school-based research with adolescents.