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Clearly, if the design work has already been carried out by the customer, the work of creating the prototype will proceed along an established course, but it is important to remember that before something is physically created and actually viewed, touched, handled and put into action for the first time it is often repeatedly revised. It is quite common, therefore, for people to have to go back on their ideas.
This is a classic problem that requires great experience. Only people who have been producing prototypes for years, and who know about materials, costs, and the difficulties of creating new products can speed things up while saving money at the same time.
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