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While physics is often promoted as being for everyone, its cultural narrative, i.e., what physicists do and who they are, has been and continues to be created by a dominant social group. As such, many students who come from marginalized backgrounds in physics are required to fit themselves into its narrow culture that does not reflect who they are and how they see the world. As physics educators, we have unconsciously internalized this narrow physics culture and need resources to help broaden our perceptions. To this end, we suggest some design principles for creating materials that help physics educators reflect on these issues and disrupt inequitable structures in their classrooms. We draw on the STEP UP project to exemplify how these design principles were implemented. 

To address the longstanding problem of underrepresentation of women in physics, we developed two classroom interventions that encourage womens' future physics intentions. In testing these lessons in a larger study, we found variance in gains between student sub-populations across several teachers. This prompted the current mixed methods analysis to follow up on potential contextual factors leading to these differences, including social and economic setting of the school and student population characteristics, as well as teacher-level effects. We drew upon multiple sources of data collected from both teachers and students including teacher interviews, teacher and student open response surveys, and student artifacts from the lessons. In our preliminary analysis, we found that the broader social and economic environments did not appear to affect how students received the lessons; however, individual teacher implementation of the lessons did. 

As part of the STEP UP 4 Women project, a national initiative to empower high school teachers to recruit women to pursue physics degrees in college, we developed two lessons for high school physics classes that are intended to facilitate the physics identity development of female students. One discusses physics careers and links to students' own values and goals; the other focuses on a discussion of underrepresentation of women in physics with the intention of having students elicit and examine stereotypes in physics. In piloting these lessons, we found statistically significant improvements in students' identities, particularly recognition beliefs (feeling recognized by others as a physics person) and beliefs in a future physics career. Moreover, female students have larger gains than male students in future beliefs (seeing themselves as physicists in the future) from both lessons, which makes it promising to contribute to alleviating the underrepresentation of women in physics. Using structural equation modeling, we test a path model of various physics identity constructs, extending an earlier, established model. In this paper, we also compare a preliminary structural analysis of students' physics identities before and after the career lesson, with an eye towards understanding how students' identities develop over time and due to these experiences.