Why do the BA and BS checklists show courses that aren’t being offered in the current academic year?

The Yale course catalog lists more than 2,000 courses. Yale faculty may add, switch, or modify their courses each academic year. The BA and BS checklists are updated annually in response to changes in course offerings – discontinued courses are removed and new ones are added that fill core requirements.  The checklists always show more courses than offered in a given semester or academic year, but students can be confident that every course (or an approved substitute) will be offered at least once during their four-year academic career at Yale.