"Leveled Literacy Intervention" ("LLI") is a short-term, supplementary, small-group literacy intervention designed to help struggling readers achieve grade-level competency. The intervention provides explicit instruction in phonological awareness, phonics, fluency, vocabulary, reading comprehension, oral language skills, and writing. "LLI" helps teachers match students with texts of progressing difficulty and deliver systematic lessons targeted to a student's reading ability. The What Works Clearinghouse (WWC) identified two studies of "LLI" that fall within the scope of the Beginning Reading topic area and meet WWC group design standards. Two studies meet WWC group design standards without reservations, and no studies meet WWC group design standards with reservations. Together, these studies included 747 students in grades K-2 in 22 schools in three school districts across three states. "LLI" had positive effects on general reading achievement, potentially positive effects on reading fluency, and no discernible effects on alphabetics for beginning readers.