Since the release of ChatGPT a little more than six months ago, students have quickly figured out how to get the free AI chatbot to do their homework for them. That has sparked a burst of activity by teachers at schools and colleges to change their assignments to make them harder to game with this new tech — and hopefully more human in the process. But pulling off these “assignment makeovers,” as some instructors are calling them, turns out to be challenging, and what works differs significantly depending on the subject matter and type of assignment.