Most codes follow a system, indicating classes that may sign up for the course; other classes will be excluded. For instance:
12 First-years and sophomores only
34 Juniors and seniors only

A plus sign (+) appended to such codes signifies "until the first day of class." For instance:
4+ Seniors only until first day of class
23+ Sophomores and juniors only until first day of class

Other notes:
PREQ There is a prerequisite for the course; see catalog
PERM Permission of instructor required
FEE   There is a special fee for this course
R   Course has restrictions; see catalog
W  W-courses are not available to students in Humanities or who have already met the composition requirement
XP      Course meets for extra periods
XLIST Crosslisted; use the CRN for the course given as "REG for" (registration will be changed later if needed.)
LL Lecture prof listed 1st, lab prof 2nd

95 May not receive credit for both PSY 284 and PSY 302
96 Lab actually runs 1:30 - 4:20
97 Afternoon lab will extend 60 min. longer than listed
98 Lab actually ends 12:15
99 Not open to students with credit for ECO 105