# Project Roles TrialGrid uses Role Based Access Control (RBAC). TrialGrid has a standard set of Permissions which control actions users are permitted to take within Projects and Drafts. Sets of permissions are grouped into [Roles](project_role_definitions.html.md#url-role-permissions) which are defined at the Organization level and shared across all of the organization's URLs. Within each Project, users can be assigned to these Project Roles. > **Warning:** Deleting a Project Role removes all the users with that Project Role from all associated Projects. Contents: - [Project Roles](project_role_definitions.html.md) - [Project Role Permissions](project_role_permissions.html.md)