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<br />. <br /> <br />by the test, the system is economically justified and fornulation <br />is complete. If any components are not incrementally justified, they <br />should be dropped and the "last added" analysis repeated. <br /> <br />The system selected by this strategy will be a feasible system <br />that is economically justified. Assuming the method of devising the <br />alternative systems is rational, the chances are good that the major <br />worthwhile projects will have been identified. On the other hand the <br />chances that this system provides the absolute maximum net benefits <br />is relatively small. This strategy would require between 30 and 60 <br />systems evaluations for a moderately complex (15 component) system. <br /> <br />b. First Added Strategy. - This strategy is designed such <br />that its successive application will yield the formulated system. <br />The performance of the systems. that includes the base components <br />(if any), are evaluated with each potential addition to the system in <br />the "first added" position. The component that contributes the <br />greatest value (net benefit) to the system is selected and added to <br />the base system. The analysis is then repeated for the next stage <br />by computing "first added" value of each component to the system <br />again. the base now including the first component added. The strategy <br />is continued to completion by successive application of the first <br />added analysis until no more component additions to the system are <br />justified. <br /> <br />21 <br />