When your classroom is a global one, filled with well-informed online learners, they don’t cut you much slack. Hundreds of people pore over every element of your course, making well-informed and sometime acerbic comments. Academics who run Massive Open Online Courses MOOCs are finding that they can’t afford any sloppy reasoning, one-sided arguments, or narrow perspectives when teaching to a massive global audience.As academic lead at FutureLearn, a company offering free online courses from UK universities, I’ve seen that this instant feedback can be eye-opening for course designers.On a university campus, students stick around even though the teaching may be dreadful, because they need the degree qualification. In MOOCs they leave as soon as they lose interest.