This article proposes a case study to demonstrate the employment of a Multi-Criteria Decision Making Method based on studies developed by Simon (1972); Roy (1998);Masui, (2003) and others. It is applied on the evaluation of the design of existing products with regards to sustainability. Two ceiling fans available in the market are compared, based on several criteria related to best practices for reducing environmental impacts, also known as ecodesign. Results show that the method provides support for the establishment of performance indicators, which may favor the analysis of complex and important issues which are often subjective, allowing a better integration between disciplines and throughout the value chain of the project.