Courses normally available for credit towards a baccalaureate degree carry numbers from 200 to 599. Courses numbered below 300 are termed junior courses, those numbered 300 or higher are senior courses.
The numbering of courses at the 200, 300, 400, and 500-levels in a particular field is intended to indicate the level of sophistication involved. Although some senior courses do not have prerequisites, it is very often the case that a 200-level course is a prerequisite for a 300-level course, a 300-level course is a prerequisite for a 400-level course, etc. The Faculty regularly publishes a list of senior courses that do not have prerequisites on its website.
Undergraduates may register in graduate courses at the 600-level only with the permission of the Department or Program offering the course.