Experience has shown that in most industries it is easier to meet the increasing challenge of producing more economic and yet reliable, aesthetically pleasing and environmentally friendly product if a holistic decision making approach of concurrent engineering is adopted in product development. For example, making a part from injection-molded plastics instead of pressed sheet metal is expected to involve large changes in design, new production facilities and widely different economic and environmental impact analysis. This is because the materials and processes used in making the product can have a large influence on its design, cost, and performance in service. These activities are interdependent and should not be performed in isolation from each other. Introducing a new engineering product or changing an existing model involves making designs, reaching economic decisions, selecting materials, choosing manufacturing processes, and assessing its environmental impact.
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