This paper proposes a group decision-making process by using multi-objective programming to address three-dimensional concurrent engineering (3D-CE) problems involving product, process and supply chain design. This paper uses opinion of decision makers to evaluate of the candidate suppliers and to determine importance of criteria by considering lack knowledge/information in the early design stages. For identifying impact of the lack knowledge/information on selecting the best configuration of product design, assembly/manufacturing process and suppliers of components, a numerical example is represented for two states of intuitionistic fuzzy and fuzzy. The evaluation showed that the configuration selected for two states are completely different.
