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2. Alt, M. N. & Choy, S. P. (2000). In the middle: Characteristics of public schools with a focus on middle schools. Statistical analysis report (NCES 2000-312). Washington, DC: US Government Printing Office.
3. Bill & Melinda Gates Foundation. (2010). Working with teachers to develop fair and reliable measures of effective teaching. Retrieved from https://docs.gatesfoundation.org/Documents/met-framing-paper.pdf