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kc-unit 7 - ISE 388 ENVIRONMENTAL ISSUES IN PRODUCT...

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ISE 388: ENVIRONMENTAL ISSUES IN PRODUCT DEVELOPMENT (UNIT_7) 7 - 1 Environmental Assessment Tools/Methods (continued) IV. Spider or Polar Diagrams These diagrams are used for the assessment of products against a set of environmental criteria chosen by the product development engineers/analysts. It can also be used for comparison of different designs/products/solutions. As shown in Figure 1, spider or polar diagram is an excellent tool to facilitate discussions, overviews and presentations. Figure 1: Spider or polar diagram [1]
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ISE 388: ENVIRONMENTAL ISSUES IN PRODUCT DEVELOPMENT (UNIT_7) 7 - 2 a. ECONCEPT. Spider Diagram The spider diagram developed by ECONCEPT uses flexible set of criteria. The definition of axis will depend on the project focus and scope as well as users needs. The following 3-step procedure is employed to perform the analysis. 1. Define the appropriate set of criteria and name each spoke of the diagram with one criterion 2. Assess and grade the aspects according to the criteria (grade = 0 very bad at the origin of the spoke up to grade = 6 very good, along the axes from the center to the outside). 3. Fill in the results by marking on the spokes For example, the following set of eight parameters is applied to compare two design solutions: Resource Efficiency, Fulfillment of needs, Sustainable use of renewables, Safety, Cost efficiency, Avoidance of hazardous substances, Longevity, Recyclability ECONCEPT used spider diagram to compare to solutions by using the following criteria Criteria Solution 1 Solution 2 Resource efficiency Moderate (3) Better (4) Fulfillment of needs Better (4) Better (4) Sustainable use of renewables Not good (2) Better (4) Safety Moderate (3) Moderate (3) Cost efficiency Moderate (3) Not good (2) Avoidance of hazardous substances Better (4) Moderate (3) Longevity Moderate (3) Better (4) Recyclability Not good (2) Better (4) Scale used: (Very bad=0; Bad=1; Not Good=2; Moderate=3; Better=4; Good=5; Very Good=6) Figure 2 shows the two solutions plotted on a polar diagram.
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ISE 388: ENVIRONMENTAL ISSUES IN PRODUCT DEVELOPMENT (UNIT_7) 7 - 3 Figure 2: The ECONCEPT Spider Diagram – Comparing two solutions [1] b. SONY’s Spiderweb Diagram SONY Europe is one of the first companies, which used spider or polar diagrams. The following criteria for the axes were used: Total energy use, Hazardous Materials/waste, Time for dismantling, Material / product labeling, Recycling rate, Input of recycled materials, Reduction of material use, Energy use in production Figure 3: The Sony spiderweb diagram [1].
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ISE 388: ENVIRONMENTAL ISSUES IN PRODUCT DEVELOPMENT (UNIT_7) 7 - 4 c. LiDs Wheel LiDs wheel, as shown in Figure 3, is another example of spider or polar diagrams developed by van Hemel and Brezet and the ECONCEPT spiderweb. LiDs Wheel is also a qualitative tool used for brainstorming.
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