Every semester course number at Northeastern University consists of three parts:
-  A two- or three-letter department code
 
-  A single-letter code, most commonly U to indicate an undergraduate course or G to indicate a graduate course
 
-   A three-digit number
For example, in the course number ECN U115, ECN is the department code (indicating the Economics Department), U indicates an undergraduate course, and 115 is the three-digit number.
Undergraduate:
-  001-099 Basic/preparatory
-  100-299 Introductory level
-  300-499 Intermediate level
-  500-699 Advanced level
-  700-799 Research, thesis, capstone
-  900-999 Special course work (directed study, independent study, special topics, seminar, workshop, practicum)
Graduate:
-  001-099 Basic/preparatory
-  100-199 Introductory graduate level
-  200-399 Master's and doctoral level course work
-  400-599 Master's level clinical practice, internship, directed study, readings, tutorials
-  600-699 Master's level research and thesis
-  700-799 Doctoral level course work
-  800-899 Doctoral level research and dissertation