It is usual to consider AIDS as applicable mainly to digital data; this data can usefully be divided into two main data management requirements that are unlikely to integrate for many years.Data is required for active control of the aircraft and weapons system. This data must be immediately available to the pilot, aircraft and weapons control system; its integrity tends to demand triplex or quadruplex data sources with comprehensive Built In Test and reversionary mode operation under fault conditions. Some data also needs to be stored to aid subsequent fault diagnosis and ground maintenance but usually represents a very low data storage and analysis requirement.