When reviewing single-case design research, the What Works Clearinghouse (WWC) first reviews each single-case design experiment within a study (or research article) to determine whether it meets standards. For each experiment that meets standards, the WWC then uses visual analysis to characterize the evidence of a causal relationship. The WWC…

This manual presents 12 guidelines to help teachers of students with mental retardation make more informed decisions about instruction by gathering and using student performance data. Development of the guidelines incorporated both teachers' recommendations and researchers' findings about what procedures work best, and guidelines were tested in…