The shift to the Common Core at the Lazaro Cardenas Elementary School, a pre-K to third grade school in a predominantly Latino area in southwest Chicago, rested on instructional improvement efforts Jeremy Feiwell initiated five years earlier in 2006, when he became Cardenas's principal. Feiwell knew from his years as a teacher at Cardenas that…

At KIPP Comienza Community Prep--an elementary school in Huntington Park, California, where 94 percent of students qualify for free lunch, and more than 60 percent are English language learners--most kindergarteners start out well below pre-reading levels. In 2015, however, just a few years after these students walked in the school doors unable to…