Ulrich and Eppinger (2008) define the design process in six steps: 1. Investigating user needs, 2. Concept design, 3. Initial development, 4. Concept evaluation and detailed design of the selected concept, 5. Design checks by drawings, models and mock-ups, 6. Information exchange with engineers and customers. Concept design at Step 2 is an important part of the design process in which design solutions are found and product functions are structured prior to the detail design processes which would require great investment and create heavy workload.
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