Some classes restrict enrollment to students in a certain level or major. Other classes may have enforced requisites, restrict drops to a short period, or require a contract.
Class restrictions include class level, major or minor, or instructor consent
Information about requisites, co-requisites, and level of enforcement
Some high-demand courses reduce the time a student can drop a class from four weeks to two weeks
Some courses, such as upper-division tutorials, require a contract that sets forth the type of study and requires instructor and department chair signatures