The Early Intervention Reading Software Program (EISP) encourages literacy growth and achievement in students in grades K-3. The program addresses early reading through the use of computer-based literacy software which provides individualized instruction designed to supplement students' classroom learning. During the 2017-2018 school year, these software programs were used in 79 local education agencies (LEAs) and 403 schools and by approximately 100,951 students. The schools use the software to build literacy skills for all students in kindergarten and first grade, as well as for intervention with students in second and third grade. Three aspects of the EISP were studied: (1) students use of the program during the school year ("program implementation"); (2) the effects the program had on increasing students' literacy achievement ("program impacts"), including program effects across all seven software programs (program-wide) and between each software vendor (vendor-specific); and (3) trends in program implementation and impacts across multiple years of program implementation.