Rainbow handled “start-to-finish” passage and item development in Riverside’s proprietary content management system (CMS). Our team of assessment experts wrote passages and crafted multiple-choice items with rationales for Grades K, 1, 2, 5, and 6. The assessment suite was built to the Common Core State Standards for ELA in the Reading Literature (RL), Reading for Information (RI) in Grades 2–8, as well as the Reading for History (RH) and Reading for Science and Technical Subjects (RST) in Grades 6–8. Additionally, all grades required some items written to Language standards 4 and 5. Rainbow’s design team provided full-color art and illustrations for K–1 passages and items.