In 2015, Journal of Counseling and Development, published a special issue on the applicability of single-case research designs (SCRD) in counseling. How this publication impacted and guided the field of counseling is unknown and many developments in SCRD literature have since emerged. Authors present findings from their research illuminating current trends of SCRD studies in counseling, investigate researcher’s use of effect indices for treatment effectiveness, and explore the relationships between indices to inform methodological practices.