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A hallmark of current science education reform involves teaching through inquiry. However, the widespread use of inquiry-based instruction in many classrooms has not occurred (Roehrig and Luft in Int J Sci Educ 26:3–24, 2004; Schneider et al. in J Res Sci Teach 42:283–312, 2005). The purpose of this study was to investigate the impact of a professional development program on middle school science...