The central premise of this study was that the use of graphing calculator technology helped improve students' achievement in upper level biology courses. The populations studied included high school students in a block course entitled "AP Biology/AP Calculus" and students in a traditional AP Biology course. There appears to be a positive effect on student understanding and achievement on standardized exams when the graphing calculator is regularly used in an integrated science/math course. Students enrolled in the integrated Advanced Placement Biology/Advanced Placement Calculus block course where graphing calculators were a meaningful part of the curriculum performed significantly better on the Advanced Placement Biology exam when compared to students enrolled in the traditional Advanced Placement Biology where graphing calculators were not heavily integrated into the course. There appears to be a positive correlation between integrating graphing calculators in the higher level biology classes and the understanding and achievement of the students enrolled in the integrated course. (ASK)