Patent ID: 7660697

Claim:
An apparatus calculating size tolerances of a plurality of parts constituting a structure comprising: a tentative size tolerance setting section setting tentative size tolerances of the plurality of parts based on design data of the structure and part information of the plurality of parts; a primary analyzing section calculating a quality of the structure and sensitivities of the plurality of parts based on the tentative size tolerances set by said tentative size tolerance setting section; a judging section judging whether or not the quality calculated by said primary analyzing section satisfies a desired quality which the structure demands; a secondary analyzing section calculating, if said judging section judges that the quality calculated by said primary analyzing section does not satisfy the desired quality, the size tolerances of the plurality of parts using the sensitivities calculated by said primary analyzing section such that the structure satisfies the desired quality; and a restriction setting section for setting restrictions on the size tolerances of one or more of the plurality of parts, wherein said secondary analyzing section sets the size tolerances of the one or more parts for which said restriction setting section sets the restrictions on the size tolerances such that the restrictions are satisfied.