Requirements traceability for a system

Every requirement for a system is defined at a distinct level of detail, and these levels are ordered from the highest level down to the lowest level. A trace relation connects two requirements from adjacent levels. Every requirement that is not a top level (highest level) requirement, must trace to one or more requirement at the next higher level. All requirements, except those at the lowest level, must trace to one or more requirement at the next lower level.


BLAM		Functional decomposition of a system