“…In the late 1950s, when the National Science Foundation first funded the design of hands-on science materials for schools, curriculum developers became frustrated by what they saw as teachers' failure to enact curricula in ways that reflected an understanding of the structure of scientific disciplines (Bruner, 1960). More recently, learning sciences researchers engaged in curriculum development projects have found that teachers using reform-oriented curriculum materials enact them either to a limited extent or in ways that do not reflect the intentions of designers (Brown & Campione, 1996;Reiser et al, 2000;Songer, Lee, & Kam, 2002;Spillane, 1999). These observations about science curriculum implementation are similar to observations made about reading and mathematics programs, where concern about implementation and the consequences of poor implementation on impacts on student outcomes are recurring themes in evaluation studies (Rowan, Camburn, & Correnti, 2004;Sarama, Clements, & Henry, 1998).…”