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If the policy of concurrency is applied to a major hardware system, such as a nuclear power plant, the need will prevail for design changes in relatively large numbers after the initial design release. Concurrency means that selected portions of design, procurement, fabrication, and installation activities are planned to occur simultaneously so as to enable completion of the overall program within less time than otherwise would be the case. Government agency studies have shown that for comparable programs overall costs are significantly reduced by schedule compression, to a certain point, by applying the policy of concurrency. Further schedule compression beyond a certain point, involving even greater amounts of concurrency, tend to increase overall program costs.