Multiple phases, multiple leaderboards

By default, a challenge has only one phase, but a challenge can have as many phases as you want. As a rule of thumb, you should have separate phases for separate tasks (e.g., segmentation vs. classification) and use separate phases to split your submission period into, for example, a qualification and a final test phase. Type 2 challenges generally consist of two phases (preliminary and final) per task type. Type 1 challenges in turn might have a single phase only.

Each phase has its own submission procedure and its own leaderboard. To add a phase, navigate to Admin and click on Add a new Phase in the sidebar under Phases.

Above that you see the links to the settings pages for each of the phases you have set up. You can customize the submission and scoring procedure for a given phase, set start and end dates for the phase, and decide what the leaderboard looks like and how the results are displayed.

⚠️ Note that if you set start and end dates, participants will not be able to make submissions to this phase before / after the respective start / end dates. Note also that you are free to set only a start (for an open-ended phase) or only an end date, or leave both dates empty. If there are no dates set, participants will be able to make submissions as long as the submission limit is set to a value above 0.

Examples of challenges that have made use of multiple phases are Midog2021 or PAIP2021.