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<br />A formulation strategy that identifies the obviously good <br />system components while preserving flexibility for future changes <br />is desirable. A practical working strategy, based on successive <br />incremental evaluations of the value of system components, would be <br />to apply the first and last added tests through sufficient stages <br />to identify and screen out those components that are obviously good <br />and obviously inferior and zero in on the system to be selected by <br />logical combinations of the remaining projects. <br /> <br />Because of the uncertainty contained in the information used <br />in system formulation, it is essential that limited sensitivity analysis <br />be conducted that is designed to identify information inadequacies and <br />senstitive system components. In addition continuing reappraisal of <br />information inadequacy as each component of a system is studied for <br />implementation is necessary. <br /> <br />. <br /> <br />32 <br />