Is there a role-based structure that is used to authorize access to the application?

Yes. Administrators have access to all data within an account and can configure granular access permissions for users. Roles include: Administrator, Manager and Contributor. Contributor Roles can be customized for a granular level of access to projects, knowledge, and accounts. For example, a user may be a Contributor on Proposal A and have no access or any other role on Proposal B.