Research on corrective feedback (CF), a central focus of second language acquisition (SLA), has increasingly examined how teachers employ CF in second language classrooms. Lyster and Ranta's (1997) seminal study identified six types of CF that teachers use in response to students' errors (recast, explicit correction, elicitation, clarification request, metalinguistic cue, and repetition) as well as target linguistic foci (lexical, phonological, and grammatical errors). These taxonomies have remained dominant in observational studies conducted in a growing range of second language teaching contexts. Several studies have acknowledged that contextual factors may influence how teachers provide CF (e.g. Mori, 2002;Sheen, 2004) with few generalizable conclusions. The present study brings together research in this area in the first comprehensive synthesis of classroom CF research seeking to aggregate proportions of CF types teachers provide, as well as their target linguistic foci. Findings reveal that recasts account for 57% of all CF while prompts comprise 30%, and grammar errors received the greatest proportion of CF (43%). The study further identifies a range of contextual and methodological factors (i.e. moderators) that may influence CF choices across teaching contexts, such as student proficiency, teacher experience, and second/foreign language context. A clearer picture of the patterns of CF that teachers provide and the variables that influence these choices serves to complement the growing body of research investigating the efficacy of CF in second language pedagogy.

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Applied linguists have turned increasingly in recent years to meta-analysis as the preferred means of synthesizing quantitative research. The first step in the meta-analytic process involves defining a domain of interest. Despite its apparent simplicity, this step involves a great deal of subjectivity on the part of the meta-analyst. This article problematizes the importance of clearly defining and operationalizing meta-analytic domains. Toward that end, we present a critical review of one particular domain, corrective feedback, which has been subject to 18 unique meta-analyses. Specifically, we examine the unique approach each study has taken in defining their domain of interest. In order to demonstrate the critical role of this stage in the meta-analytic process, we also examine variability in summary effects as a function of the unique subdomains in the sample. Because different techniques used to identify candidate studies carry assumptions about the type of research that falls within the domain of interest (e.g. published vs. unpublished), we also include a brief review of search techniques employed in a set of 81 meta-analyses of second language research. Building on the work of In’nami and Koizumi (2010) and Oswald and Plonsky (2010), the results for this phase of the analysis show that L2 meta-analysts generally rely on a stable but very limited set of search strategies, none of which is likely to yield unpublished studies. Based on our findings related both to domain definition and search techniques employed by L2 researchers, we make specific recommendations for future meta-analytic practice in the field.

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