Abstract
In the early stage of the development process, designers propose and verify product concepts by means of experiments and calculations from various perspectives. The process is not solely deductive, but assumptions regarding the attributes of product concepts such as shapes, mechanisms, and material properties in order to effectively advance the verification process. This paper proposes a method to consider such assumptions made on the model of a product concept for the simulation of the concept verification process. The method helps designers understand how particular assumptions influence the progress and resulting cost of the verification process.