This determines how athletes and relays are distributed amongst heats, sections, or flights. The actual lane or position within a heat, section, or flight is determined by the next section concerning Lane or Position Placement.
Field Event Flight Assignment Choices
 | Seed Mark |
| Random |
By choosing seed mark, the best group of athletes will be in one flight, the 2nd best group of athletes in another flight, etc. To distribute athletes amongst flights regardless of entry mark, choose random.
Running Event Heat Assignment Choices
| Seed Time |
| Random |
| Seed Prelims as Timed Finals |
| Seed Timed Finals as Prelims |
If the event is one round and you choose Seed Time, the best group of athletes will be in one section, the 2nd best group of athletes in another section, etc. To distribute athletes amongst sections regardless of entry time, choose Random.
| Running events with more than one round will use the serpentine method of seeding if you select Seed Time, but will seed the first round like time finals if you select Seed Prelims as Timed Finals. |
Serpentine refers to the method of making a list of athletes and assigning heats based on the order of the list, working alternately from left to right and right to left. This does not assign positions or lanes, but simply places athletes in heats. If you select Seed Time, the order of the list will be fastest to slowest, with no time / no mark entries (NT, ND, NH) being randomly placed at the end of the list. If you select Random, the order of the list will be random for round 1 and all successive rounds regardless of qualifying time.