Educational Research Institute of America (ERIA) conducted a pretest-posttest study to assess the effectiveness of Science Dimensions in upper elementary school during the spring semester at 11 schools. Grade 4 participants included 23 teachers and 537 students, and Grade 5 participants included 21 teachers and 498 students. Results indicate that Science Dimensions produced statistically significant gain scores for students in both Grades 4 and 5. The results also indicated the average gain scores for both the low- and high-achieving pretest students were statistically significant.