The Alfresco membership framework is very secure, flexible, scalable, and customizable. Roles are collections of permissions assigned to users (consumer, contributor, editor, collaborator, and coordinator). You can manage system users and groups through the administration console. Security is imposed by assigning a role to a specific user or group for a specific space or content. Authentication is possible using Alfresco built-in membership system, NTLM, and LDAP. In the next chapter you would learn about how you can manage your documents in Alfresco.