Abstract
If we can persume probable future cost according to requirements at the early design stage, we can cost plan adequately with this general guide line. This is true even if for the same kind of buildings, cost statistics obtained by the layered division of cost cause no less deviation from the mean value. So we analysed the building cost or element cost as dependent variance with plural construction planning factors, on multiple regression analysis by forward selection. Also, research was made on the statistic "cost for a guide" according to information available at the design stage, and inquired about the relationship between such variances.
