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Representative samples are designed to reflect characteristics or qualities present in the population and are important for accurate research. Representative samples are designed to reflect characteristics or qualities present in the population and are important for accurate research.
The uniting concept is a focus on applying the ' engineering design process, in which engineers develop new products or processes with a primary emphasis on functional utility.he next responsibility of many design engineers is prototyping. A model of the product is created and reviewed. Prototypes are either functional or non-functional. Functional alpha prototypes are used for testing and the non-functional are used for form and fit checking.