The third objective addressed by this study was to compare the impact of instructional method (constructivism verses traditionalism) with regard to middle school students‘ academic achievement. When comparing the data from each instructional method, as displayed in Table 3, the mean differences between the students‘ growth reported for each method should be calculated. Sixth grade students averaged 60.78% growth in the inquiry-based unit compared to42.5% growth in the traditional unit. So, the mean difference of student growth for the sixth grade students was 18.28%. Seventh grade students averaged 54.22% growth in the inquiry-based unit compared to 47.89% growth in the traditional unit. So, the mean difference of student growth for the seventh grade students was 6.33%.