The computational mechanics suffers a lack of modifiability and interactivity, which leads to neglecting its potential to help engineers in solving problems faster and cheaper. The fully integration of computer design in computational mechanics will tackle this problems, by means of providing the capability to explore design variations within an analysis environment and with a direct feedback from the mechanical simulation. Our paper states the advantages of such a solution and presents a theoretical concept, which can enrich computational mechanics with modeling functionalities from computer design, enabling a design-analysis iteration loop.