A critical appraisal of five review articles on the transition to adulthood for youth with disabilities was conducted to identify evidence about (1) the factors that help or hinder the transition process, and (2) "what's working" in transition services. The appraisal identified a number of important "success" factors and elements of service delivery that are worthy of consideration by service providers and researchers. These include the need for skill development of youth with disabilities, environmental supports, and an individualized approach to service delivery. All of the reviews identified the need for more evidence to support the implementation and evaluation of best practice models/approaches that address the complex issue of the transition from paediatric to adult services for youth with disabilities.