Replication Research

Replication studies are essential for building cumulative knowledge in second language acquisition (SLA) research because they allow researchers to revisit, contextualize, and extend the findings of earlier studies. Rather than arguing for the value of replication, this chapter focuses on the replication research process itself. It begins with two core issues: deciding what study to replicate and what kind of replication to conduct (conceptual, approximate, close, or exact). It then considers the place of replication in qualitative research. The chapter reviews methodological considerations for planning a replication, supported by a set of planning questions, and for disseminating it through presentations and journal articles, including reporting standards. It then describes the practical relevance of replication for building confidence in findings before they are applied and for testing lab-based results in classrooms. The chapter closes with future directions: integrating replication into research programs, extending it beyond quantitative methods, improving planning and reporting, and adopting open research practices.