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Abstract
The purpose of this chapter is to outline the literature search methods used in preparation for the research review to be presented in subsequent chapters. How were specific reports chosen over all of those available, and how were the data from each report summarized? What were the primary and secondary library resources that were most helpful? Were computer assisted searches used, and with what result? Of critical importance, what criteria were developed for including versus excluding studies from the many examined? And what specific effect size (ES) calculations were made in each of the groupings to be reported? Finally, what planned comparisons were made, that is, how were studies regrouped for additional comparisons beyond those covered in the individual reports?
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