The purpose of this article is to present Convergent Evidence Scaling (CES) as an emergent method for combining data from multiple assessment indicators. The CES method combines single-case assessment data by converging data gathered across multiple persons, settings, or measures, thereby providing an overall criterion-referenced outcome on which to base decisions. Examples are described using CES for monitoring treatment integrity and for treatment evaluation to demonstrate the use of the method within consultation problem-solving and response-to-intervention models. The article concludes with a discussion of the strengths and limitations of the CES method. (Contains 3 tables.)