A study concerned with the problem of apportioning funds allocated to weapon system improvement between cost and benefit estimates (information gathering) and actual product improvement. A rule is outlined whereby the decisionmaker, on the basis of certain subsystem characteristics, can deter- mine when to stop gathering information and when to initiate changes to enhance weapon system performance. A technique suggested for ranking a particular subsystem depends on the subsystem's failure rate, the number of subsystems of this type in the weapon system, the cost in weapon system downtime of a subsystem failure, the maintenance cost of a subsystem failure, the initial cost of the weapon system, and the weapon system's expected service life
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