An individual code has been allotted to each unit of study. The code is three or four letters to represent the subject area followed by one digit to represent the level of the unit: 1 = 100 level, 2 = 200 level, 3 = 300 level etc followed by two further digits to distinguish the particular unit. For example, the unit code for Medicinal Chemistry is CHEM342, indicating that it is a Chemistry unit and 300 level.