Progeny Review: An Alternative Approach for Examining the Replication of Intervention Studies in Special Education

Despite the importance of replication for building an evidence base, there has been no formal examination to date of replication research in special education. In this review, we examined the extent and nature of replication of intervention research in special education using an “article progeny” approach and a three-pronged definition of replication (direct, conceptual, intervention overlap). In this approach, original articles (i.e., parent studies) were selected via a stratified, random sampling procedure. Next, we examined all articles that referenced the parent articles (i.e., child studies) to determine the extent and nature of the replication of the original studies. Seventy-five percent of the parent studies were replicated by at least one child study. Across all parent studies, there were 39 replication child studies. Although there was a high overall replication rate, there were a limited number of conceptual replications, and no direct replication studies were identified.