Over the past several years, K–12 teachers in the United States have increasingly had more access to instructional materials aligned with their academic standards. As of the 2020– 2021 school year, according to data from the American Instructional Resources Survey (AIRS), 42 percent and 26 percent of math and English language arts (ELA) teachers, respectively, indicated that they used, at least weekly, one or more core curriculum materials that were rated as standards-aligned by EdReports.1 These rates of use represent 8-percentage-point and 9-percentage-point increases for math and ELA, respectively, since the first year of the AIRS in 2019. However, teachers’ primary use of standards-aligned material lags behind the adoption of the materials within schools and districts: Just 31 percent of math teachers and 17 percent of ELA teachers reported using standards-aligned material for the majority of their classroom instruction time (Doan, Kaufman, et al., 2022).