The achievement effects of Comprehensive School Reform (CSR) programs have been studied through the use of input-output models, in which type of CSR program is the input and student achievement is the output. This study focuses on observations of math and reading/language arts lessons in classrooms implementing an array of CSR programs to better understand what occurs in CSR classrooms. The authors found that students were productively involved in assigned tasks and that classrooms were pleasant and task oriented in both mathematics and reading/language arts.