If you want to sell this to teachers, you need to talk about how you will decrease their prep. time. Any hint of increasing prep. time is a show-stopper. E.g.

If you want to sell this to teachers, you need to talk about how you will decrease their prep. time. Any hint of increasing prep. time is a show-stopper. E.g. I do about 2-4 hours of unpaid work for every paid hour in the classroom.