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<br />This strategy would probably identify the obviously desirable <br />projects, as would the others. However, its weakness is that it is <br />possible, though not too likely, that groups of projects that would <br /> <br />, <br /> <br />not be justified are carried along because of their complex linkage <br /> <br /> <br />with the total system. For example, the situation sometimes exists <br /> <br /> <br />where reservoirs on say two tributaries above a damage center are not <br /> <br />justified together but deletion of each from a system that includes <br />both results in such a great loss in system value that individual <br />analysis indieates neither should be dropped individually. <br /> <br />The number of SysteMS analysis required for this strategy <br />would be similar to the first added strategy requiring perhaps 10-20S <br />more evaluations. Twenty-two last added analyses were made in the <br />four stages required to select four new projects out of seven alter- <br />natives. This strategy is more efficient than the 'first added' if <br />the majority of the potential system additions are good ones. <br /> <br />d. Strategy Discussion. - Each of the strategies presented <br />had one or another shortcoming. If the system were formulated using <br />the 'first added' strategy, then formulated using the 'last added' <br />strategy and the formulated systems come out to be identical, the <br />best system probably would have been formulated. It is possible, <br />however, that the 'first added' system would not include some <br />feasible projects and that the 'last added' system would include <br />some that are not valid system components as described previously. <br />One approach to arrive at the formulated system would be to formulate <br /> <br />, <br /> <br />26 <br />