Previously, product environmental impacts were calculated after a product was developed to the component design stage. A hierarchical Bayesian approach is used to estimate the potential environmental impacts of specific functions when realized into components. The environmental impact of functions has been calculated for 17 of the products found in the Design Repository using ReCiPe scoring in SimaPRO. This paper contributes a method of automated function component generation, and guided down-selection and decision-making based upon environmental impact. However, little attention has been paid to developing conceptual design methods that explicitly take into account environmental impact. Over the last two decades, consumers have become increasingly aware and desiring of sustainable products. By focusing on a select set of "critical" functions, more design domains can be included in the database facilitating analogy retrieval founded on the qualification of KPPs. The ultimate focus of this research project is to create a performance-metric-based analogy library, called the design analogy performance parameter system (DAPPS). These CFs will enable multiple analogies to be presented to a designer by recognizing similar functionality across distant design domains and incorporating key performance criteria. A critical function (CF) is a function within a functional model whose performance directly relates to a key performance parameter (KPP) of the system as a whole. The concept of critical functionality is the idea of identifying only a certain set of pertinent design functions observed in a single domain that significantly define the functionality of the product. This research defines the basis for a new quantitative approach for retrieving useful analogies for innovation based on the relevant performance characteristics of functions.
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