| C1 | Age Groups and Abbreviations |
| C2 | Official Grades and Abbreviations |
| C3 | Country Names and Abbreviations |
| Indicator | Age Range | Meaning |
|---|---|---|
| J/U20 | Junior | Under 20 and over 16 years. |
| U17 | Under 17 | Under 17 and over 15 years. |
| M35/W35 | 35-39 | Over 35 but under 40 on day of competition. |
| M40/W40 | 40-44 | Over 40 but under 45 on day of competition. |
| M45/W45 | 45-49 | Over 45 but under 50 on day of competition. |
| Birthday between 1 Jan and 31 Aug | 1 Sept - 31 Dec | |
|---|---|---|
| U13 | year of birth+11&12 | year of birth+12&13 |
| U15 | year of birth+13&14 | year of birth+14&15 |
| U17 | year of birth+15&16 | year of birth+16&17 |
| Jun | year of birth+17, 18 or 19 | year of birth+18&19 |
| Sen | year of birth+20 | year of birth+20 |
| M35/W35 | dob+35 Years TO dob+40 Years-1 day | |
| M40/W40 | dob+40 Years TO dob+45 Years-1 day | |
| M45/W45 | dob+45 Years TO dob+50 Years-1 day | |
| M50/W50 | dob+50 Years TO dob+55 Years-1 day | |
| GRADE | DESCRIPTION |
|---|---|
| CS | Chief starter |
| CT | Chief timekeeper |
| TR | Track referee |
| FR | Field referee |
| F1 - F4 | Field judge 1 - 4 |
| S1 - S4 | Starter grade 1 - 4 |
| T1 - T4 | Timekeeper grade 1 - 4 |
| M1 - M4 | Marksman grade 1 - 4 |
| PJ | Photo finish judge |