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Visual design features are important for customers as well as function designs to make product attractive. Enhancing product functions can increase cost and environmental impact, while improvement of visual design may not cause increase of environmental impact.This paper discusses a method to quantitatively evaluate the importance of functional and visual design. Using smartphones as a case study, the paper proposes a procedure to evaluate both functional and visual design. The paper applied pair comparison to evaluate the relative importance of 4 visual design features. Then, the result of our previous survey regarding relative importance of 4 functional design items were integrated. Then, the value of smartphones was defined by considering both functions and visual design features.The result showed that functional design features are basically more important than visual design features. However, difference of the most important visual design feature and the least important functional design feature was rather small. This fact suggested that by focusing on providing fancy visual featues rather than increasing unnecessary functions can be a good strategy for resource-efficient design. The paper also measured material compositions of three models of smartphones and calculates environmental impacts based on TMR (Total Material Requirement [1]). Finally, actual values of the resource efficiency were calculated and some general strategies to design resource-efficient products were discussed. Through this effort, an idea to integrated evaluation of functional design and visual design of products were shown and the first step to resource-efficient design has been made.
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