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Pursuant to a congressional request, GAO responded to questions concerning the Federal Aviation Administration's (FAA) Wide Area Augmentation System's (WAAS) development costs and the FAA's decision to replace the contractor, focusing on the: (1) history of WAAS cost estimates and major factors in cost changes; (2) history of WAAS program requirement changes and sources for these changes; (3) factors in FAA's decision to terminate the Wilcox contract; and (4) implications of ending WAAS' development at the completion of Phase I.

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