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  1. A grand challenge of the computer science (CS) for all education movement is the preparation of thousands of teachers with high quality, accessible professional development (PD) that has evidence of improving teacher knowledge and pedagogical practices necessary to support the learning needs of diverse groups of students. While regional PD programs can provide in-person learning opportunities, geographic and time constraints often inhibit participation. This article shares findings from an online PD program modified from the existing in-person exploring computer science PD program to provide teachers a facilitated online learning community model to support their first year teaching the course. The findings from this study have implications for future directions in the CS education field, indicating that this model of online PD, heavily based on shared experience among participants, can increase CS teachers’ confidence in adapting and delivering lessons designed to be engaging and accessible to all students. 
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  2. Computer science (CS) education is plagued by a gender divide, with few girls and women participating in this high-status discipline. A proven strategy to broaden participation for girls and other underrepresented students interested in CS is the availability of teacher preparation that requires classroom teachers to grow their knowledge of CS content as well as the pedagogical practices that enhance inclusive learning opportunities for historically underrepresented students. This case study describes the design and impact of an Online Professional Development (PD) for CS teachers, a year-long PD program aimed at broadening participation in the United States. Using survey and observation data from more than 200 participants over three years in PD settings, this paper examines how the design of an online learning community model of PD provides an inclusive venue for teachers to examine their belief systems, develop inclusive pedagogical practices, and collectively transform the culture of CS classrooms to places that support all learners. Findings suggest that purposeful facilitation creates a transformative culture of “shared experience” whereby facilitators and groups of teachers engage in collaborative lesson planning and debriefing discussions, in both synchronous and asynchronous sessions. This case study can inform other online PD efforts aimed at broadening participation in computing. 
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