Green product design is a knowledge-based resource (Millset al., 2003) because intangible property such as talents, creativity or skills are developed and applied to fulfil demands of the current market and these sets of knowledge subsequently build competitive edge. According to Kuo et al. (2001), the goals of green productdesign or DfE are minimize use of non-renewable resources, effective management of renewable resources and reduce the volume of toxic emissions. Although these goals were adapted as measures of ecodesign by Zhu and Sarkis (2007) and Eltayeb et al.