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Effective teaching requires teachers to leverage their knowledge of how students think about and learn specific topics (i.e., pedagogical content knowledge). This longitudinal qualitative study of early-career biology instructors examines the development of this specialized teaching knowledge. 

Abstract Here, we systematically review research on teaching knowledge in the context of undergraduate STEM education, with particular attention to what this research reveals about knowledge that is important for evidence-based teaching. Evidence-based teaching can improve student outcomes in undergraduate STEM education. However, the enactment of promising evidence-based teaching strategies depends greatly on the instructor and potentially on the teaching knowledge they are able to deploy. The review includes an overview of prevalent teaching knowledge theory, including pedagogical content knowledge, mathematical knowledge for teaching, and pedagogical knowledge. We compare and contrast teaching knowledge theory and terminology across STEM disciplines in order to build bridges for researchers across disciplines. Our search for peer-reviewed investigations of teaching knowledge in undergraduate science, engineering and mathematics yielded 45 papers. We examined the theoretical frameworks used in each study and analyzed study approaches, comparing across disciplines. Importantly, we also synthesized findings from research conducted in the context of evidence-based teaching. Overall, teaching knowledge research is sparse and siloed by discipline, and we call for collaborative work and better bridge-building across STEM disciplines. Though disciplinary divergences are common in discipline-based education research, the effect is magnified in this research area because the theoretical frameworks are themselves siloed by discipline. Investigations of declarative knowledge were common, and we call for increased attention to knowledge used in the practice of teaching. Finally, there are not many studies examining teaching knowledge in the context of evidence-based teaching, but the existing work suggests that components of pedagogical content knowledge, pedagogical knowledge, and content knowledge influence the implementation of evidence-based teaching. We describe implications for future teaching knowledge research. We also call on those who develop and test evidence-based strategies and curriculum to consider, from the beginning, the teaching knowledge needed for effective implementation. 

College instructors faced a rapid transition to remote instruction in spring 2020, and with it a host of new teaching challenges. This qualitative study investigates what 26 college biology instructors learned about students and teaching during this time. We used semi-structured interviews and content analysis to identify instructor learning that is relevant beyond the COVID-19 pandemic. Participants described two related insights about students: They became more aware that students' lives outside the classroom are complex, and they realized that their campus can act as a neutralizing space for students. Participants also reconsidered how they assess student learning. New realizations about students and teaching have the potential to impact teaching practices when in-person instruction resumes. Especially promising is an increased focus on students as individuals and the recognition that not all students experience life and courses in the same way. We relate findings to existing research and propose self-reflection questions that these findings raised for us