Interval Teacher reads assignment and provides written feedback to student. Assuming weekly classes and a link between class activities and homework assignments, at this point students are reading feedback on an assignment related to a class that happened over two weeks earlier. If assignments are given weekly, another assignment has already been completed, and a third has been given. Student interest in the assignment from Class one may wane. Interval Students do assignment.
Students send assignment to teacher.
Teacher reads assignment and provides written feedback to student. Teacher returns assignment Students read teacher's feedback. The teacher can plan for class 2 having already had two-way communication with students about class 1. The students have received feedback from class one's assignment before class two begins. At first glance, this looks like a lot of work.