This STEM education study investigates the Streamline to Mastery professional development program, in which teachers work in partnership with university researchers to design professional development opportunities for themselves and for fellow teachers. Our research describes the process of teacher professional growth both through changes in agency and through a shared pursuit of an improved understanding of classroom scientific inquiry. Videos, emails, lesson reflections, survey responses, and interviews were analyzed to glean insight into changes in teacher discourse around inquiry and into their shifts in participation within the professional community they established. Implications for professional development in STEM education are discussed.
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