Estimating temporal trends in the incidence of diabetes among US youth (disease occurring before age 20 years) by type and race/ethnicity using efficient and low-cost population-based surveillance strategies.Among those with diabetes onset in childhood and adolescence, assessing the long-term impact of the disease, with special focus on health-related perceived quality of life, incidence of and risk factors for acute and chronic complications, by type and race/ethnicity.Among young adults who developed diabetes in childhood or adolescence, assessing access to and quality of care during the transition from pediatric to adult healthcare services.