Secondary sources are documents or records that interpret, analyze, or summarize information from primary sources. They are not original data but are based on other research.Examples of Secondary Sources in Educational ResearchTextbooks summarizing educational theoriesReview articles or literature reviewsAcademic journal articles analyzing past studiesDocumentaries about educational historyReséarch papers that compare other researchers’ resultsBiographies of educators or theoristsCommentaries and editorialsEncyclopedias or education-focused databasesAnalysis of survey results conducted by someone elseMeta-analysis or systematic review of existing studiesSecondary sources help researchers gain background knowledge, see trends, or identify gaps in existing studies.