Researchers at the University of Oregon conducted formal alignment studies to evaluate the alignment of the easyCBM measures to the Common Core State Standards (CCSS). Results of these alignment studies are published on https://www.brtprojects.org/publications/technical-reports/
A secure read-only Google spreadsheet that shows standards alignment by test form and item has been developed across the benchmarks and progress-monitoring Proficient Math measures, items are balanced across CCSS domains, with approximately 2-4 items per CCSS standard.
The Proficient Math K-8 spreadsheets have tabs along the bottom of the main sheet organized by grade. Within each tab, the first column gives test form number (both progress monitoring [test forms 1-10] and benchmarks [BM1 = Fall, BM2 = Winter, and BM3 = Spring]), the second column gives the test item in the order they appear on each test form, and the remaining columns give the CCSS Domain and CCSS Cluster (Grades K-2) and CCSS Domain and CCSS Cluster and CCSS Standard (Grades 3-8). You can use this information to identify areas of weakness for students who have taken the Proficient Math benchmarks and under-performed, and to understand how all strands are represented on these fundamental skills benchmarks/progress-monitoring assessments.