This chapter introduces the methodological tools of research synthesis in the context of corrective feedback (CF) research and highlights findings in this area generated by synthetic approaches. Meta-analysis, the most common approach to research synthesis in applied linguistics, has quickly gained much popularity in CF research, with at least twenty meta-analyses conducted on CF by the time of this publication (more than in any other area of applied linguistics research). The chapter describes the value of research synthesis to CF research and how meta-analyses have helped consolidate findings in this domain and provided insight into the range of moderating variables that may influence the effectiveness of CF. Methodological synthesis, a type of research synthesis used for taking inventory of methodological approaches, has also provided guidance for future advancements in designing research methodology in this domain, which are explored. The chapter concludes by summarizing the contributions of research synthesis within CF research and provides cautious guidance in the interpretation of findings in synthetic research.