Some brands developed their own PMSs, such as Marriott’s FSPMS and FOSSE, Starwood’s Galaxy and Hilton’s OnQ; others standardized on third-party systems. However, in all cases they mandated only the PMS and left it up to the individual properties to decide what to use for their other operational areas. As a result, several vendors who concentrated on chain-hotel business focused on producing pure PMSs, with functionality covering the traditional core of individual and group reservations, check-in/checkout, folio charges, housekeeping/rooms management and the all-important CRS interface. MSI, RoomKey, Galaxy, SkyTouch and Infor’s epitome and HMS are examples.