# Challenges types
At Oktonine, there are three types of challenges that can be created by a company representative. The challenge type depends on how the company wants to collaborate with schools.
Challenges proposed by companies (outside a call-for-challenges) are only displayed at Oktonine's
# Private challenge
If a company wants to collaborate with a specific teacher within a specific school, it should publish its challenge as
Private. The company needs to add this teacher as a collaborator of the challenge.
By doing that, the challenge will only be visible to this teacher.
# Public challenge
If a company wants to provide a challenge for anyone using Oktonine, it should publish its challenge as
Public. The company doesn't have to specify a collaborator.
By doing that, the challenge will be visible for everyone using Oktonine, and the company won't be able to see who is working on its challenge.
# On-demand challenge
If the company wants to work with students and teachers from any school, without preferences, it can define its challenge as
The company will receive applications from teachers to collaborate with them.
If the company accepts a teacher's request, they can convert the challenge into a