“…Recently developed effect sizes that allow for the combination of effects from single case and group designs (e.g., between-case effects, design comparable effects) may allow for more representative analyses of special education research (Shadish et al, 2015). Although increasingly featured in meta-analyses of SCD (e.g., Maggin et al, 2017), some researchers maintain the distinct methodological procedures and effects of single case and group designs are fundamentally incompatible (King, Kostewicz, et al, 2020). Despite these misgivings, the What Works Clearinghouse (What Works Clearinghouse [WWC], 2020), the primary research evaluation entity of the Department of Education, recently established a preference for design comparable effect sizes and no longer requires visual analysis to be used in characterizing study findings.…”