text: Teachers know the subject because they went to college to teach that subject and know it well. The students would probably make the assignment so short and useless so they can mess around all summer. It is best that the teachers design it because they might need the students to learn material that they do not have time in the school year to teach. They can also use this assignment to get less important information out of the way so they can spend time on more important information. Or spend time on a hard unit that the students have not grasped yet.