Most colleges and universities have fairly lenient drop/add policies. Students can drop a course well into the semester, and courses can be added during a short time window at the beginning of the semester or term. During that course add period, some students do course shopping. They sign up for a course, attend the first couple of sessions, then drop the course and replace it with another course. Some students course shop regularly and extensively. A group of researchers were curious about the details of this course-shopping behavior. They wondered how prevalent it was, whether students who course shopped shared any demographic characteristics, whether students shopped for some kinds of courses more than for others, and most important, if the behavior influenced GPA and course completion