4.3 System Effectiveness
System effectiveness is a measure of the ability of a system to
achieve a set of specific mission requirements. It is a function of readiness
(or availability), and mission success (or dependability).
Cost and time are also critical in the evaluation of the merits
of a system or its components, and must eventually be included in making
administrative decisions regarding the purchase, use, maintenance, or discard
of any equipment or system.
The operational effectiveness of a system obviously is
influenced by the way the equipment was designed and built. It is, however,
just as influenced by the way the equipment is used and maintained; i.e.,
system effectiveness is influenced by the designer, production engineer,
maintenance man, and user/operator. The concepts of availability and
dependability illustrate these influences and their relationships to system
operational effectiveness. The following are the definitions of these