The occurrence code in eVision is four characters long (e.g. DNIA) and is made up of three pieces of information:
Location
| Code | Location |
| AK | Auckland |
| CH | Christchurch |
| DN | Dunedin |
| IV | Invercargill |
| QN | Queenstown |
| WN | Wellington |
Teaching method
E for external/distance-taught and I for internal/on-campus.
Availability
| Letter | Availability |
| A | Available, i.e. is running in that semester/year |
| H | Holding, i.e. is a departmental permission paper |
| N | Not available, i.e. not running in that semester/year |
| S | Suspended |