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  1. This paper examined changes in students' biological reasoning, scientific sensemaking, valuing of science, and fascination in science over the course of a school year after their teacher participated in one of the two professional development programs. One professional development (PD) group emphasized teacher collaboration in revising materials for their classroom, while the other emphasized revision of materials without collaboration among teachers. Results from repeated measures ANOVA showed improvements in students' biological reasoning from the beginning to end of the school year when in classrooms led by teachers who participated in the collaboration-focused PD. Students' scientific sensemaking, valuing of science, or science fascination remained stable across the school year across both PD groups. 
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  2. Using the IQA-SOR instrument, we analyzed participating teachers' classroom implementation of instructional resources and models. Teachers who collaboratively designed their materials for the focal lessons demonstrated more rigorous implementation, while those who only experienced the focal lessons during the PD experience did not implement as rich of instruction. However, all participating teachers did show strengths in implementing particular aspects of the focal lessons. 
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  3. Recent educational reforms conceptualize science classrooms as spaces where students engage in Science-as-Practice to develop deep understandings of scientific phenomena. When students engage in Science-as-Practice they are constructing explanations, arguing from evidence, and evaluating and communicating information to develop scientific knowledge (NGSS Lead States, 2013). This process of learning requires a focus on productive science talk in which students grapple with and socially negotiate their ideas (Kelly, 2014) through interactions involving talk, joint attention, and shared activity aimed at building, negotiating, and refining new understandings of phenomena and relevant science concepts (Ford, 2015; Michaels & O’Connor, 2012). Productive talk requires the ‘nimble’ involvement of the teacher to help students productively contribute their ideas to the class and use them as resources to drive instructional activities supporting the development and refinement of more sophisticated scientific understandings (Christodoulou & Osborne, 2014; González‐Howard & McNeill, 2020). 
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  4. Current reform efforts in science education focus on creating environments where students grapple with and negotiate their own understandings and mechanistic explanations of scientific phenomena by using their knowledge of disciplinary content and science practices. In order to support this reformed vision, effective professional development (PD) for science teachers is critical. If PD is to shape teachers’ practice, teachers must experience a change in attitudes and beliefs. The research presented here explores the epistemic orientation of three secondary science teacher cohorts who were supported in different iterations in a larger professional development study. The epistemic orientation toward teaching science survey was administered at three time points for each cohort and paired sample t-tests were performed to analyze composite and dimensional scores. Our analysis revealed that change in epistemic orientation occurred for teachers who engaged in two years of supportive PD, but that one year of support was not sufficient to engender change in epistemic orientations. These findings further support the need for continuous, high-quality, longitudinal PD when the goal is a shift in science teachers’ epistemological beliefs and teaching practices. 
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  5. As part of a larger study focused on supporting high school biology teachers' use of productive science talk, this study compares the use of two different observation protocols, the RTOP and the IQA-SOR. Reviewing a year-long data set of video observations collected from classrooms of teachers participating in the larger professional development study, the two validated instruments produced significantly correlated scores of different scales based on the unique structure of each tool. We posit this demonstrates that both instruments can be useful for analyzing classroom instruction intended to emphasize productive science talk. However, the instruments do possess unique structural and theoretical qualities that warrant this study to understand the insights afforded by each. The similarities and differences emerging from each are explored in the presentation and how they impact the analyses. These considerations can be helpful for scholars who research in-service teacher learning as classroom implementation and impact on student learning activities are general outcomes that most professional development research endeavors to explore. Further, considerations of what a particular observation protocols’ foci include will be necessary so that continued research on teacher learning works to make science learning through discourse accessible to all learners. 
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  6. null (Ed.)
  7. Krell, M. ; Vorholzer, A. ; Nehring, A. (Ed.)
    Assessments of scientific reasoning that capture the intertwining aspects of conceptual, procedural and epistemic knowledge are often associated with intensive qualitative analyses of student responses to open-ended questions, work products, interviews, discourse and classroom observations. While such analyses provide evaluations of students’ reasoning skills, they are not scalable. The purpose of this study is to develop a three-tiered multiple-choice assessment to measure students’ reasoning about biological phenomena and to understand the affordances and limitations of such an assessment. To validate the assessment and to understand what the assessment measures, qualitative and quantitative data were collected and analyzed, including read-aloud, focus group interviews and analysis of large sample data sets. These data served to validate our three-tiered assessment called the Assessment of Biological Reasoning (ABR) consisting of 10 question sets focused on core biological concepts. Further examination of our data suggests that students’ reasoning is intertwined in such a way that procedural and epistemic knowledge is reliant on and given meaning by conceptual knowledge, an idea that pushes against the conceptualization that the latter forms of knowledge construction are more broadly applicable across disciplines. 
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