The purposes of this study were: to determine the degree to which student attitudes were changed by the use of minicourses and to produce a model which could be used by other academic departments interested in the use of minicourses. The study included 240 students in four sections of Earth Science at the University of Northern Colorado. Each student was required to elect three one-hour minicourses to fulfill his general education requirement. Student attitudes were determined by a Self Evaluation Questionnaire (SEQ) pretest and posttest. A t-test was used to test significance of change in mean scores and Chi-square analysis using 101 matched pairs was also used. Significance was determined to be the .05 level. A telephone survey was used to assess change in student affective behavior. The findings of the study showed significant positive change in attitude of students toward earth science. (Author/EB)