The new numbers will become effective for the Fall 2012 semester. Students will register in Spring 2012 for fall 2012 courses under their new numbers. (http://trinity.duke.edu/curriculum/course-renumbering) Old Course Numbering (prior to Fall 2012) 0-99: Introductory-level (1-49 primarily for 1st year students) 100-199: Advanced-level 200-299: Seniors and graduate students 300-399 Graduate students only New Course Numbering (effective Fall 2012) 0-99: Advanced placement credit; House courses; First-year seminars; First-year writing; Registrar/Department special purpose 100-199: Introductory-level undergraduate courses; Basic skills/activity courses; Foundation courses; Focus program courses 200-399: Undergraduate courses above introductory level 400-499: Advanced undergraduate; Senior seminars; Capstone courses; Honors thesis courses 500-699: Graduate courses open to advanced undergraduates 700-999: Graduate only courses (not open to undergraduates)