The first digit indicates the level of the course:
0100 - 0999
Elementary courses.
1000 - 1998
Introductory courses usually taken during the first year. The basic course in each subject is usually 1000.
2000 - 2998
Intermediate courses usually taken during the first and second years.
3000 - 3998
Senior courses usually taken during the third year.
4000 - 4998
Senior courses usually taken during the fourth year.
1850, 2850, 3850, 4850
Numbers which designate Topics courses in various disciplines.
2980-85, 3980-85, 4980-85
Numbers which designate Applied Studies in various disciplines.
1990, 2990, 3990, 4990
Numbers which designate Independent Study courses in various disciplines at the undergraduate level (3.0 credit hours).
1999, 2999, 3999, 4999
Placeholder courses.
4995
Undergraduate Thesis courses.