Most process plants use computerized maintenance management systems (CMMSs) to record instrument and other asset data, issue work orders and store work order results. CMMS's have been around for decades, and many process plants are quite familiar with their CMMSs and see no reason for replacement.CMMS replacement is usually not needed, but it is often helpful to augment the CMMS with asset management software (AMS). Asset management can include everything from relatively simple software that gathers instrument data to highly sophisticated programs that analyze data, predict failures and direct preventative maintenance.