Fuzzy Decision Modeling of Product Development Processes

Product development has become a focus of competition in many industries. Due to decreasing product life cycle, it is important to reduce the time and cost of product development. The product development process includes six main phases: product planning, concept development, system-level design, detailed design, testing and refinement, and production ramp-up [34]. Concept development process consists of four stages: identifying customer needs, establishing product specifications, and generating and selecting product concepts. Recent efforts have been made to improve the product development decisions [20], especially at the early stages of product development, since it has been recognized that nearly 75% of product life-cycle cost is committed by the end of concept development [26]. However, it is difficult to make product design decisions at the early development stages, because decision makers have to consider all life cycle issues [21, 22] with vague project information available.

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