Hi Jean: Relying on past classes is what they call experience. You know what has worked and has not worked. Sometimes I accidently stumble onto something that's wonderful and I adopt it for regular use. I like trial and error, and sometimes it's a hit and miss. Student feedback also provides information about content. In my profession, it's very dymamic and things are changing with new instrumentation, technology, terminology, and practice standards. Content has to be up to date. Being willing to try new methods of delivery, better ways to convey important concepts, is essential for growth as an instructor and maximal benfift to the students. Regards, Barry