The WWC reviewed the research on Reading Recovery®, a supplemental program designed to help grade 1 students improve their literacy skills through one-on-one tutoring and tailored lessons. Based on the research, the WWC found moderate evidence that Reading Recovery® positively impacted student achievement in literacy, and promising evidence that the program positively impacted writing productivity, receptive communication, and writing conventions skills. The WWC found uncertain effects of the program on math and general academics achievement. This new WWC intervention report summarizes the evidence on Reading Recovery®, updating an earlier report from 2013, and provides detailed information about program implementation and cost.