"Headsprout Early Reading"[TM] is an Internet-based supplemental early literacy curriculum consisting of forty 20-minute animated episodes that are designed to teach phonemic awareness, phonics, fluency, vocabulary, and comprehension. The program adapts to a child's responses, providing additional instruction and review if a child does not choose the correct answer. Teachers may use stories based on the episodes to reinforce instruction provided in the lessons. One study of "Headsprout Early Reading"[TM] meets What Works Clearinghouse (WWC) evidence standards and no studies meet WWC evidence standards with reservations. This study included 62 preschool children across five classrooms in two Head Start centers in Florida. Based on this study, the WWC considers the extent of evidence for "Headsprout Early Reading"[TM] to be small for oral language and print knowledge. No studies that meet WWC evidence standards with or without reservations examined the effectiveness of "Headsprout Early Reading"[TM] in the phonological processing, early reading and writing, cognition, and math domains. "Headsprout Early Reading" [TM] was found to have potentially positive effects on oral language and print knowledge. [The following study was reviewed in this report: Huffstetter, M. (2005). The effects of an Internet-based program on the early reading and oral language skills of at-risk preschool students and their teachers' perceptions of the program. Unpublished doctoral dissertation, University of South Florida, Tampa. (68813195).]