LLI is a short-term literacy intervention developed by Fountas and Pinnell to prevent literacy difficulties. It works to bring students to grade-level performance through 30-minute small group lessons 5 times a week that include rereading, phonics, introducing new books, and word work. Students' progress is monitored weekly through running records to determine when they are ready to advance to the next level. LLI is designed to be completed within 12-18 weeks.