I've found that when teaching a new course, it is difficult to determine whether the pace of the course will keep up with a predetermined calendar/schedule of topics to be covered. I often include the disclosure "Course outline accurate through week 5. Changes may be made to the course outline through week 5." This gives me the flexibility to rewrite or adjust the pace of material after evaluating the overall progress during the first few weeks. Question: Is this ethical? I haven't had any complaints about it so far..