Hi Cynthia: Very good point. Matching course content with sequential or layered learning levels really takes careful planning, and should be done by individuals with training and experience to do so. Your other point is good too. Some teachers like to emphasize subjects or topics they like, know well, or feel students "should know it", whether it's part of the curriculum or not. When students performance suffers because of course difficulty beyond what the course calls for, boy, that really a shame. Regards, Barry