A comparison of CHEM Study and traditional chemistry classes showed no difference in student achievement in chemistry. The curricula did not have a differential effect on high vs. low ability groups. However, a difference in student attitude toward CHEM study and the traditional text, "Modern Chemistry," was observed. The students found CHEM study more difficult and less satisfying than the traditional curriculum. In this study, 33 CHEM study and 24 "Modern Chemistry" classes in the Rocky Mountain region of the United States were selected at random and given the following tests: Test on Achievement in Science, Science Process Inventory (SPI), Science Attitude Inventory (SAI), and Learning Environment Inventory. In addition, the teachers were administered the SAI and SPI. The statistical analysis of the test scores is described in detail. (BB)