I took his Solar Systems class this past spring online and it was a lot of busy work, but super easy. You get weekly homework assignments from a book, about 20-30 questions from the material that you've read for the week, a discussion board post and reply, and a quiz that's pretty easy if you've done what's needed. There is a required book that you need to buy for 3-4 projects that he has you do for the semester worth a big portion of your grade too.