• Chatterji, Madhabi. (2005). Evidence on “What Works”: An Argument for Extended-Term Mixed Method (ETMM) Evaluation Designs. In Educational Researcher (Vol. 34, Number 5, June/July, pp. 14–24). Washington, DC: American Educational Research Association.
• National Center for Education Statistics (the two data tables in GS & KO presentation, plus related information)

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