Circa is a web application running on the main Sierra's webserver and is available from anywhere that https is available, yet it still only supports legacy Sierra only staff accounts and not SSO via SAML. Changing all staff login functions to require SSO and disabling legacy Sierra only account support is an important step towards Sierra being a secure ILS at the enterprise level. Not supporting SSO creates extra burden on staff by requiring another password, removing the ability to enforce strong authentication, and adds extra account support costs for a busy and non-technical team.