Thomas Mennella teaches biology at Bay Path University. He began using a flipped classroom approach four years ago. He likes the dynamic and interactive learning experience his students enjoy, but he is burned out from having to do so much grading and the number of hours he has to spend interacting with his students. According to Mennella, an instructor with 86 students who makes four assignments a week has to grade 344 assignments a week, and 3,784 per semester. My question for him is, why do you have to make four assignments a week?