“…Two important factors in teachers learning to use innovations are teachers' CK, defined as knowledge of the subject matter, and PCK, the specialized knowledge of curriculum, students, teaching, and assessment used by teachers to transform content knowledge into knowledge for teaching subject matter (Magnusson, Krajcik, & Borko, ; Park & Oliver, ; Shulman, ). Both CK and PCK affect teachers' practice (Abell, ; Childs & McNicholl, ; Falk, ; Kind, ; Park & Chen, ; Roehrig & Luft, ). When new research‐based innovations, such as learning progression‐based standards (i.e., Next Generation Science Standards) and learning progression‐based curriculum materials, are introduced into the classroom, teachers' CK and PCK influence how they understand the purpose and use of those innovations (Cohen & Yarden, ; van Driel, Beijaard, & Verloop, ).…”