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Most government and industry leaders involved with Department of Defense acquisition programs emphasize the importance of requirements and cost stability. However, despite all the stated support for program element stability and acquisition reform, frequent changes are experienced in acquisition programs that affect the final end product in terms of changes to unit design, number of units procured, system and subsystem capability, as well as affecting the overall cost of the program. This study analyzes the U.S. Navy’s F/A-18A model to identify requirements changes; discern the reasons for change and the impact the resultant change made on the program (funding, schedule, capacity, etc.); and develop recommendations for limiting requirements creep, instability, and cost growth in future programs.