Hi Earle: Good - these are good examples. Also, we want to keep our eye on the course objectives to make sure we are using the most relevant resourcse available in order to teach the course in the best way. We may find that certain media is more convenient or prefered and end up being used more often. With some thought, we might decide there are better choices to accomplish the objective more effectively. Unless we experiemnt here and there, we'll never know if there are better ways. Regards, Barry