In early design stages there is big room of design changing, however, there is not enough information about the product being considered. While in latter deign stage, although designer could get more information about the product, room of design change would be limited. CAE-based evaluation system would be one of solutions to such kind of problems. However, to apply CAE into such kind of system, quick turn-around time is necessary because it is not so usual that user could spend much time for design consideration in this stage. Also, methodology of making up for lack of product information is necessary. This paper shows a trial of such kind of CAE-based evaluation system with computer aided optimization software iSIGHT.