The Next Generation Science Standards (NGSS) call for K-12 science instruction that centers on and substantively takes up students' science ideas. In this paper, we explore the question, “What role might physics faculties play in preparing teachers in the era of NGSS?,” as we also consider our field's adage that “most teachers tend to teach as they were taught.” In particular, we propose the importance of teacher education experiences that take teachers' own physics ideas seriously. We argue that physicists can play a critical role in this work by designing and facilitating teacher preparation and professional development that (1) elevates and maintains a focus on teachers' physics ideas and (2) collaboratively subjects teachers' ideas to the kinds of tests to which we subject our own ideas. We ground these considerations in two illustrative episodes from our local context: Focus on Energy professional development for elementary teachers. We highlight particular professional development instructor moves that take teachers' ideas seriously, and we discuss questions and implications that emerge from our analysis. Although the focus of our analysis is on taking teachers' ideas seriously, we suggest that most of our arguments also apply to taking students' ideas seriously in pre-college and university physics courses.

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All teacher and PD instructor names are pseudonyms.

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We are able to speak to what Isaac wants because he is a co-author on this paper (LS). We gave him a pseudonym in the paper—a name that starts with “I,” to set instructors apart from participants.

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To watch a video of this scenario, go to: https://focusonenergy.terc.edu/resources/classroom/stopper.html).
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Full transcript and audio of the episode can be found here: goo.gl/zWXxBW.
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Because we cannot see Brian's or Pam's faces, it is difficult to draw conclusions about why Brian says this. Our guess is that Pam says something inaudible just before, or that her facial expression has communicated something to him that he interpreted as her questioning his support.

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