Concluding Remarks A total SPS program has been defined and costs for such a program estimated. The scope and complexity of the program, coupled with the necessity of projecting technology over a long period of time obviously limit the accuracy of such an estimate. Despite these difficulties, the cost estimates are useful as a reference for comparison with alternate approaches and as a guide for assessing the relative cost importance of the various program elements and components. The cost estimates presented in table 1 were obtained from studies conducted by the Boeing Aerospace Company as part of the SPS Systems Definition effort.
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