Competition Format

The OzCLO contest is held in two rounds.

The First Round is a two hour competition, usually held in February or early March, at a number of locations across Australia. Participants work in teams of four on a range of language analysis problems. The teams are usually selected by their schools. The competition is held at the local host university, with some schools also being able to act as host. In 2012, we introduced a web-based option. The top three teams for each region then go on to the National Round, which has the same format as the First Round. The National Round is usually held in late March, with results announced around Easter.

The winners of the National Round are offered the opportunity of representing Australia at the International Linguistics Olympiad (ILO), which is usually held in late July or early August.

All participants complete the same tasks, with achievements recognised at the Junior level (years 9-10) and the Senior level (years 11-12).


Registration is free. When the competition is open (early February), this website handles registration.

Training Sessions

Training sessions for participants are held at some locations, and training materials are also available on this website. We explain how the competition is run and give an overview of the fields of linguistics, computational linguistics and language technologies. We also go over sample problems and give tips for solving them. If you would like to find out more about training sessions in each state, please email the local organisers.