What do you understand by user class in Cognos?

It indicates the group of users who have the same rights and required to access the same data. It is the duty of the administrator to build the user class and catalog. This job of the creating and maintaining user class can also be performed by the other users of the organization in their geographical area.

You are also able to build a catalog and you can add the user to it. You can also add the users to the personal copy of a distributed catalog. You will get all the rights from the administrator so you can insert or make changes of user classes