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IntroductionIn today's competitive environment,it is nec-essary to deliver products on time and within bud-get. Unfortunately,design processes have beenplagued by the severe cost and schedule overruns.In the published papers,the reported averageschedule overrun ranges from 41 %to 2 5 8%,andcost overrun ranges from 97%to 1 5 1 %. Thisproblem persists in spite of the significantadvancesthat have been made in design technology over thelast two decades[1] . In many of the cases,thisproblem of ove… 相似文献
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