“…When teachers adapt new materials with unfamiliar pedagogy, conceptual content, or evaluation methods, they can make changes which may render the result, the enacted curriculum, very different from the curriculum as intended by the designers (Anderson et al, 2018; McNeill, 2009; Schneider et al, 2005). The long‐standing cultural presumption of teachers' control of classroom process and discourse (Duschl, Schweingruber, & Shouse, 2007; Herbel‐Eisenmann, 2007; Puttick, Drayton, & Karp, 2015) may be more likely to surface in practice when a teacher is working with a curriculum for the first time, and especially if the curriculum's ideal enactment requires changes in a teacher's practice: changes will naturally be influenced by the teacher's background and educational philosophy (Arias, et al, 2016; Cohen, 1990; McNeill, 2009). Thus arises the paradox that in the earliest stages of implementing a new curriculum, a teacher may enact the curriculum with much apparent fidelity, but not with full understanding; as familiarity and ownership increase, the teacher's agency will grow as well (Hall & Hord, 1987), and their preferences, philosophy, and habitus (Bourdieu, 1980; Mauss, 1934) as practitioners will reshape the curriculum.…”