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Frank Schmidt

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During the past 30 years, meta-analysis has been an indispensable tool for revealing the hidden meaning of our research literatures. The four articles in this special section on meta-analysis illustrate some of the complexities entailed in meta-analysis methods. Although meta-analysis is a powerful tool for advancing cumulative knowledge, researchers can be confused by the complicated issues involved in the methodology. Each of these four articles contributes both to advancing this methodology and to the increasing complexities that can befuddle researchers. In these comments, the author attempts to clarify both of these aspects and provide a perspective on the methodological issues examined in these articles.