Investigates impact of a nongraded instructional organization on the reading/language development of 117 kindergarten through second graders--61 in 3 nongraded classrooms, 56 in 3 graded classrooms. Uses a pretest-posttest control group design. Indicates no significant differences between the groups on any measures. Suggests findings are important to educators implementing a nongraded organization to accelerate literacy development of at-risk populations. (PA)