Research synthesis is the practice of systematically distilling and integrating data from many studies in order to draw more reliable conclusions about a given research issue. When the first edition of "The Handbook of Research Synthesis and Meta-Analysis" was published in 1994, it quickly became the definitive reference for conducting…

The promise of science is that its methods cause others to believe its results. This foundation is served by trust, accuracy, and transparency. Unfortunately, current research practices in psychology are known to often produce inaccurate, irreproducible, and imprecise results. "Toward a More Perfect Psychology" introduces a plethora of…

When the first edition of "The Handbook of Research Synthesis" was published in 1994, it quickly became the definitive reference for researchers conducting meta-analyses of existing research in both the social and biological sciences. In this fully revised second edition, editors Harris Cooper, Larry Hedges, and Jeff Valentine present…

Six papers explore applications/implications of the unity thesis in discrete areas of educational research. The unity thesis argues that knowledge is all of a piece and allows for methodological diversity in educational research. Topics include a coherentist validity theory; policy analysis; hermeneutics; meta-analysis; and coherentist empiricism…

S. Graham comments on taking a meta-analytic approach to reviewing race differences in need for achievement, discussing limitations of the methodology. A rejoinder by H. Cooper and N. Dorr supports the utility of meta-analysis in such studies and discusses disadvantages to narrative review. (SLD)