In school districts across the nation, diverse student groups have been experiencing significant gains in reading performance after using READ 180. This compendium of READ 180 research contains 40 studies. The studies take place in a variety of settings in school districts across the country from 1999 to 2012. Summarized are correlational and descriptive studies, as well as randomized or quasi-experimental studies. Reports on reading gains for the general student population and in some cases for specific demographic groups of students are provided. The studies in this compendium show that READ 180 meets the literacy needs of even the most challenged students, and the findings of these studies have been integral in informing new and better versions of the program, including the most recent READ 180 Next Generation. An index is included.