In this seminar Morgan Polikoff reports findings from his research on school and district textbook adoptions in math, English language arts, and science. He presents quantitative evidence from SARCs and statewide longitudinal achievement data on the spread of new materials, timing of implementation, distribution across districts and schools, and impact on student outcomes. This with insights via interviews of district leaders on policies, practices guiding local curriculum adoption decisions in CA, alongside the utility of SARC data, and challenges scholars face using them for research.