“Class Section” refers to the class opened under a specific course. For example, there can be four sections of classes, A to D, opened under the course ELTU 1106. Different class sections scheduled in different time slots and taught by different instructors provide students with more choices during course enrollment.

“Class Number” is a number indicating a specific class opened in a term. For example, class number “445” can be representing the class CHEM 2320-A in 2010-11 Term 1 and representing the class BIOL 2010-B in 2010-11 Term 2. You can find the Class Number of each class when viewing the class details in CUSIS.