This review addresses the validity of published meta-analyses in education that determines the credibility and generalizability of study findings. The authors' objectives were to evaluate the current meta-analytic practices in education, identify methodological strengths and weaknesses, and provide recommendations for improvements in order to generate a more valid and credible knowledge base of what works in practice. The review was found that 56 meta-analyses followed general recommendations fairly well in problem formulation and data collection, but much improvement is needed in data evaluation and analysis.