Yeah Harvard doesn't use the same numbering systems as most other universities. It's up to the department if I recall and for the case department anything in th

Yeah Harvard doesn't use the same numbering systems as most other universities. It's up to the department if I recall and for the case department anything in the sub 100s were intro, 100-200 was for undergrad classes but could be taken for credit by students getting a masters degree and anything over 200 was graduate level (though open to motivated undergrads).