Mentoring has become an almost essential aspect of youth development and is expanding beyond the traditional one-to-one, volunteer, community-based mentoring. This volume provides evidence of the benefits of enduring high-quality mentoring programs, as well as apprenticeships, advisories, and other relationship-based programs that show considerable promise. Authors examine mentoring in the workplace, teacher-student interaction, and the mentoring potential of student advising programs. They also take a critical look at the importance of youth-adult relationships and how a deeper understanding of these relationships can benefit youth mentoring. This issue raises important questions about relationship-based interventions and generates new perspectives on the role of adults in the lives of youth.