Odyssey Reading, published by CompassLearning, is a comprehensive reading/language arts program using adaptive software for core instruction. This is the first study of CompassLearning's Odyssey Reading (CLO) in PUSD and was based on data from the school years 2006-2008. For this study, Odyssey Reading was implemented in reading classes in grades 6 through 8. The study addressed this question: Has CLO had a positive impact on overall middle school student literacy scores throughout the district? Results showed that CLO had a positive impact on 7th and 8th grade achievement on MAP Literacy. CLO did not appear to have either a positive or negative impact on 6th grade literacy achievement. This simply means that CLO was in the same range of effectiveness as the 6th grade literacy programs currently in place.