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  1. Abstract

    Recent instructional reforms in science education aim to change the way students engage in learning in the discipline, as they describe that students are to engage with disciplinary core ideas, crosscutting concepts, and the practices of science to make sense of phenomena (NRC, 2012). For such sensemaking to become a reality, there is a need to understand the ways in which students' thinking can be maintained throughout the trajectory of science lessons. Past research in this area tends to foreground either the curriculum or teachers' practices. We propose a more comprehensive view of science instruction, one that requires attention to teachers' practice, the instructional task, and students' engagement. In this study, by examining the implementation of the same lesson across three different classrooms, our analysis of classroom videos and artifacts of students' work revealed how the interaction of teachers' practices, students' intellectual engagement, and a cognitively demanding task together support rigorous instruction. Our analyses shed light on their interaction that shapes opportunities for students' thinking and sensemaking throughout the trajectory of a science lesson. The findings provide implications for ways to promote rigorous opportunities for students' learning in science classrooms.

     
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  2. This research employs the lenses of epistemological resources and framing to examine the complexities of one teacher’s efforts to position his middle-school biology students as sensemakers. Through interviews, classroom observations, and document analysis, we trace the teacher’s activation of varied epistemological resources and how such resources positioned students’ efforts throughout the lesson. While the launch of tasks was framed as an opportunity for “doing science,” this framing became less stable when the teacher engaged with students in small group work and during the wrap up that were focused on the “right answer.” Specific phases of the lesson served as a context that influenced the epistemological resources activated, helping us understand the varied, dynamic, and sometimes contradictory nature of the teacher’s moves and their consequences on students’ framing of their efforts. 
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  3. Within the science education reform movement, there have been long standing calls initiated to attend to equity in the science classroom. These calls are sought to de-settle and advance the broad strokes of “equity for all” into deeper, more meaningful actions, considering the way we view equity and how equitable practices unfold in the classroom. Productive science discourse or productive science talk is just one instructional practice used and discussed which leverages students as sensemakers. This study seeks to better understand productive science talk as a practice of equitation instruction. In examining Ms. Savannah’s practice, a high school biology teacher, two major findings emerged around the use of productive talk: (1) pattern of moves to leverage student ideas and (2) timing of moves to stimulate interest or motivation. These talk moves and timing gave insight into talk as both having the ability to hinder and foster student ideas and provide an initial “on-ramp” for students’ voice to be heard, taken up and have accountability in the classroom. This work continues to sustain a call toward attention to equity and a need to evaluate the equity-aligned practices that are fore-fronted in PDs and workshops. 
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  4. A teacher’s noticing or their ability to see and interpret classroom events is an important component of their expertise. Examination of these noticings is a way to understand changes in their learning over time. In this research, we examine changes in teacher noticing of classroom instruction for two groups that participated in slightly different professional development experiences to understand how this PD shaped their personal domain of learning. Findings suggest that both programs shaped teacher noticing and learning but in different ways. 
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  5. As part of a larger effort to understand the impact of professional development (PD) on teachers’ thinking and practices, this research explores changes in epistemic orientation (and associated practices) of two cohorts of secondary science teachers as they were involved in a longitudinal PD. To measure epistemic orientation, Epistemic Orientation toward Teaching Science surveys were administered at three-time points and teachers’ classrooms were observed. Findings suggest that change in epistemic orientation occurred for teachers who engaged in two years of PD, but that one year was not sufficient to engender such changes in epistemic orientation or instructional practice. These findings speak to the need for continuous, highquality, longitudinal PD. 
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  6. 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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  7. Reform-based instruction that fosters all students’ intellectual engagement and sensemaking is possible. However, it is not yet prevalent across many science classrooms. To gain more insight into how to design and enact science instruction supporting students’ intellectual engagement, this investigation centered on understanding how to design and implement science lessons for promoting students’ intellectual engagement as epistemic agents who shape knowledge building happening in the classroom. We examined a middle school science teacher's design and implementation of four lessons that she did as part of a PD focused on fostering productive science talk in science classrooms. Our analysis revealed that her efforts in fostering opportunities for students’ epistemic agency were evident in both her lesson design and implementation. Her responsiveness to students’ thinking/intellectual engagement throughout the lesson implementations via principled improvisations supported opportunities for students’ epistemic agency. Her efforts allow us to understand how the design and implementation of science lessons with the focus of opening space and maintaining this space by being responsive to students’ thinking are critical for fostering students’ epistemic agency. These findings can provide implications for professional development efforts that seek to develop teachers’ capacity for reform-based instruction in science classrooms. 
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  8. Researchers of teacher education have long advocated that one of the most essential supports to teacher learning of novel instruction practices comes from collaboration. Much of the collaboration literature focuses on the outcomes of teacher collaboration without providing insight into the nature of collaborations. In this work, we seek to understand the collaboration that occurred between five school biology teachers as they designed, enacted, and reflected on a lesson emerging from professional development focused on productive talk. The questions guiding this work include: What was the focus of the LCD teacher group’s collaboration?, What was the nature of the LCD teacher group’s collaboration? and, What role did the group’s collaboration serve in supporting each teacher’s practice? We found that the collaborative space opened-up opportunities for teachers to discuss their practice for the lesson and outside of the lesson itself. Salient to the collaborative space was a sense of support between the teachers as teachers intensively listened to one another, normalized a problematic issue as well as the emotions that they were experiencing by relating to each other, providing advice and words of encouragement. Teachers’ collaboration eased the work of designing and enacting a conceptually challenging lesson. 
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  9. 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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  10. 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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