My brother goes to a school where they use computers to work through lessons at their own pace. There are humans lecturing (kind of a youtube with powerpoint split video) and they solve the questioning problem by having teachers for each subject in the same room as the students.

Personally I think this is a rather stupid way to do school because you don't get that interaction that you would in a normal school, one such example would be when a teacher asks you about the current subject and you have to quickly use critical thinking to come up with an appropriate answer. This is completely lost when such a learning system is used.