In this study, through the use of focus groups and questionnaires, we will identify perceptions of transition from pediatric to adult care, transition readiness, disease knowledge, and self-management skills, and assess components of the St. Jude Children's Research Hospital (SJCRH) Sickle Cell Disease Transition Program. Participants will participate in focus groups to discuss transition and transition-related concepts and evaluate components of the transition program. Additionally, participants will complete questionnaires about specific aspects of the transition program and about current disease knowledge and management skills.