Design ethics has been offered as a course in undergraduate design programs in Taiwan for over a decade, but research on teaching design ethics and the results of teaching these courses is scant. We conducted two tests to examine the effect of an ethics course, and the differences among the effects of design department, gender, and study year on student opinions regarding ethical design standards at the National Yunlin University of Science and Technology in Taiwan. The participants comprised 934 undergraduates (...) from the five design departments at YunTech’s College of Design from Years 1–4. The results confirmed the effect of an ethics course on student EDS opinions. In addition, we observed significant variations among students according to design departments, suggesting that the characteristics of the design departments also affected students’ EDS opinions. The results indicated that gender did not significantly affect design students’ EDS opinions; however, students in their early years of study produced higher scores than those in their advanced years of study did, based on the six EDS opinions. The implications of these results for teaching design ethics and future research are discussed in this paper. (shrink)