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One way to support teachers' learning to facilitate the recent reform vision (NRC, 2012) in their classrooms is through professional development (PD). We explored a biology teacher’s (Monica) sensemaking during the PD that focused on facilitating productive science classroom discourse to understand her responses to the PD in terms of teaching science by engaging students in productive talk in science classrooms. Using both video and interview data, we analyzed the process of her sensemaking about facilitating (productive) talk during the PD and the meaning she was making of productive talk. Our analysis indicated that Monica participated in sensemaking mostly about her students' participation in talk. Throughout the PD conversations, she rarely focused on what she could do (or could have done) to facilitate student talk without the PD facilitators' pressing. This is supported by our analysis of the interviews with Monica, which showed that the sense that she was making about productive talk mostly focuses on students' contributions to the talk and their accountability to reasoning, scientific knowledge, and sensemaking. These findings provide implications for facilitating teachers’ sensemaking around new instructional practices and reforms within PD contexts. 

The reform vision brought forth by the Framework for K-12 Science Education emphasizes the integration of scientific knowledge with scientific practices as students try to figure out a phenomenon. During this process of making sense of phenomenon, students experience moments of uncertainty which is important because scientific activity is driven by this need to manage uncertainty. Using cognitively demanding tasks in science classrooms presents a means to integrate uncertainty into students’ experiences. Our analysis of video records of science lessons during the implementation of chemistry tasks at different cognitive demand levels revealed how types of uncertainty that students experienced differed in these lessons and the ways in which uncertainty was evoked during the implementation of cognitively demanding science tasks. 

This study focuses on the kinds of uncertainty experienced by students in relation to the level and kind of students’ thinking during the implementation of a cognitively demanding science task. The Framework for K-12 Science Education together with the Next Generation Science Standards emphasize the integration of scientific knowledge with scientific practices as students try to figure out phenomena. During this process of sensemaking, students experience moments of uncertainty that are a key part of doing science and drive scientific pursuits. By examining video-records of a science lesson in which the teacher and the students worked on a cognitively demanding science task, and by analyzing students’ interviews about this lesson, we identify the types of uncertainty that students experienced during the implementation of this task across the trajectory of the lesson. Moving beyond an all or nothing approach to uncertainty, our analysis reveals different kinds of uncertainty that students can experience and presents cognitively demanding tasks as a means to integrate uncertainty into students’ experiences. 

The reform vision brought forth by the Framework for K-12 Science Education emphasizes the integration of scientific knowledge with scientific practices as students try to figure out a phenomenon. During this process of making sense of phenomenon, students experience moments of uncertainty which is important because scientific activity is driven by this need to manage uncertainty. Using cognitively demanding tasks in science classrooms presents a means to integrate uncertainty into students’ experiences. Our analysis of video records of science lessons during the implementation of chemistry tasks at different cognitive demand levels revealed how types of uncertainty that students experienced differed in these lessons and the ways in which uncertainty was evoked during the implementation of cognitively demanding science tasks.