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Recently in the construction industry rationalization in production systems are aimed at in order to improve the cost competitiveness ， This time， we ceuld get the chance of controlling the cost in early stages ofdesign pro ss． In 1he conventional procedure ， the cost estimate is done in two stages consisting of preliminary estimate and detailed estimate later resulting in reconsideration of design in order to match with 亡 he budget ， Using 3D − CAD we could do the estimate in each step of design and fit into the budget

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