**ZITADEL's** own role model is built around the IAM resources. The roles have some hierarchies to them. For example a IAM_OWNER can view and edit every resource of the system. ORG_OWNERS can only manage their resources included within their organisation. This includes projects, clients, users, and so on.
You can grant ZITADEL Roles directly on a resource like organisation or project. Or, if the user is in your organisation, by applying the roles to the user directly: