Within the field of science education, there remains little agreement as to the definition and characteristics of classroom inquiry. The emerging emphasis on scientific practices in science education reform discourse is underpinned by a need to better articulate the constituent elements of inquiry‐based science. While a small number of observation‐based instruments have been developed to characterize science learning environments, few are explicitly aligned with theoretical constructs articulated by the National Research Council and/or have been substantially field‐tested. We employ a newly developed instrument, the Practices of Science Observation Protocol (P‐SOP), to investigate essential features of inquiry and scientific practices in which early learners engage in elementary classrooms. This research is part of a multiyear professional development program designed to support elementary teachers (K‐5) in a large, urban school district to learn to better engage students in scientific practices. Project teachers video‐recorded enacted science lessons (n = 124) which were used as data. Findings illustrate both essential features of inquiry and scientific practices observed in elementary classrooms, as well as establish the P‐SOP as a valid and reliable observation protocol. These findings have important implications for the design of elementary science learning environments and associated research and development efforts in the field.

While research has shown that elementary (K-5) students are capable of engaging in the scientific practice of explanation construction, commonly-used elementary science curriculum materials may not always afford them opportunities to do so. As a result, elementary teachers must often adapt their science curriculum materials to better support students' explanation construction and foster student sense making. However, little research has been conducted to explore if and, if so, how and why, elementary teachers modify science curriculum materials to engage students in explanation construction. We use an embedded mixed methods research design to explore elementary teachers' (n ¼ 45) curricular adaptations and pedagogical reasoning. We collected and quantitatively analyzed a matched set of 121 elementary science lesson plans and video recorded lesson enactments to investigate the extent to which inservice elementary teachers engage in instruction to more productively support students' explanation construction. Our findings suggest that the curriculum materials heavily emphasized hands-on engagement and data collection over explanation construction and that the teachers' adaptations did not fundamentally alter scientific sense-making opportunities afforded students in the lesson plans. Interviews and other artifacts were also collected and analyzed to construct a multiple-case study of four of these elementary teachers. Findings from the case study suggest that the teachers' conceptions of explanation construction and concerns about the abilities of their students to engage in scientific explanations impacted their curricular adaptations.Elementary students, like middle-school and secondary students, should be afforded opportunities to engage in scientific practices to develop deep conceptual understanding of natural

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