Fontana Unified School District (FUSD) is a suburban school district in Southern California. The district serves approximately 35,400 students across 30 elementary schools, seven middle schools, and five high schools. In this district, 20 of 30 of the elementary schools use A2i. FUSD adopted A2i as a way to better differentiate reading instruction for students. The district's educators hoped that gaining access to targeted time recommendations for code-focused and meaning-focused instruction would improve reading achievement gains for their students. To measure the effectiveness of A2i on student learning outcomes, in this report Scholastic compared Measure of Academic Progress (MAP®) Growth Reading data from 4,815 K-3 students who used the program to 2,938 K-3 students who did not use the program during the 2021-2022 school year. Results showed that A2i students in FUSD made significantly more gains in reading ability than their counterparts in the district who did not use the program. This difference in reading gains was largest for kindergarten and third-grade students in FUSD, where gains for A2i students were 114% and 115% higher than those of their non-A2i counterparts, respectively.