Assessing the Quality of Single-Case Design Research With Deaf Individuals

Single-case design (SCD) research is often considered a good fit for measuring intervention outcomes among low-incidence populations, including deaf individuals. The authors use criteria from the What Works Clearinghouse (WWC) to assess the quality of SCD studies across research about deaf individuals. Findings showed that out of 12 studies, less than half met the WWC standards due to weaknesses in research methodology, experimental validity, and stringency of overall design. These findings suggest a need for more rigorous study designs that are sensitive to the unique characteristics of deaf populations. The article also discusses the role of WWC and suggestions for increasing the quality and rigor of future SCD research.