As the field of education embraces the task of adopting evidence-based practices, ongoing discussion about the standards and format for determining whether an intervention is supported by data on its effectiveness will be appropriate. We propose here six criteria that may be useful in this discussion and .apply these criteria to assessment of Schoolwide Positive Behavior Support (SWPBS). Because multiple systems and practices are combined within a three-tiered behavior support framework, SWPBS presents a complex, though useful, example. We propose that a sufficiently rigorous and voluminous body of scholarship establishes SWPBS as an evidence-based practice for use in public schools, by typical educational personnel, to decrease problem behavior and promote prosocial behavior. Further research is needed, however, to Ijetter assess the breadth, interaction effects with effective intervention, and sustainability of SWPBS implementation and outcomes.