The best available evidence is one of the three critical features of evidence-based practice. Best available evidence is often considered to be synonymous with extremely high standards for research methodology. However, this notion may limit the scope and impact of evidence based practice to those educational decisions on which high quality…

The manner in which results and methods are reported influences the ability of the synthesis of prior studies for planning new evaluations. Confidence ratings, coding conventions, and supplemental evidence can partially overcome the difficulties. Planners must acknowledge the influence of their own judgement in using prior research. (Author)

The six articles of this issue discuss the place of meta-analysis in the health professions and present two state-of-the-art meta-analyses using a variety of innovative methodologies, statistics, and secondary analytic procedures. A survey conducted for this issue and its sequel explores interventions to facilitate meta-analysis. (SLD)

It is argued that, although thousands of evaluations have been conducted of social interventions, little has been done to cumulate those results to guide intervention architects. Building social intervention theory and meta analyses are suggested as ways to unify this knowledge and make it useful. (SLD)

This article introduces a mini-series on research methods in school psychology. A conceptual overview of research methods is presented, emphasizing the degree to which each method allows the inference that treatment affects outcome. Experimental and nonexperimental, psychometric, descriptive, and meta-analysis research methods are outlined. (SLD)

The implementation of research design in studies on substance abuse education is discussed in this meta-analysis. Findings indicate that the quality of research design is constrained by negative feedback from evaluation stakeholders. This finding is applied to an evaluation of the Here's Looking at You, 2000 drug education program currently…