Math in Common is a seven-year initiative launched in spring 2013 that supports a formal network of ten diverse California school districts as they implement the Common Core State Standards in Mathematics (CCSS-M) in grades K–8. The ten unifed school districts are: Dinuba, Elk Grove, Garden Grove, Long Beach, Oakland, Oceanside, Sacramento City, San Francisco, Sanger, and Santa Ana. Eight districts, all but Garden Grove and Long Beach, will continue to work together in a community of practice through June 2020. The initiative is funded by the S. D. Bechtel, Jr. Foundation. WestEd serves as the formative evaluator and California Education Partners facilitates thecommunity of practice.
Foundation staﬀ has partnered with all ten districts in the initiative's first five years through regular phonecalls, site visits, formal grant reports, participation in three community of practice meetings each year, andinvolvement in optional multi-district events. Based on this experience, staﬀ has compiled reﬂections on thisambitious investment in California's students and educators. We are sharing these reﬂections here in the beliefthat learning from Math in Common provide current "real-world" evidence of best practices applicable tostandards implementation, as well as insights into barriers districts may encounter.