Abstract: An enhanced system is provided to assist a building professional in selecting products for building projects which minimize environmental impact. Accurate data on many different building products that has previously been collected, categorized and subcategorized by product type is provided to the system. This information has previously been separated into ranks (spheres) based upon how well the data has been collected according to ISO Product Standard data requirements. A user may then interactively select values for the environmental impact parameters. Products matching the selected environmental impact parameter values are displayed, while those not matching the values are not displayed. The user may select various products. The amount of each selected product to be used on a project is acquired and used to weight the environmental impact. Costs and financial benefits are determined from the products used and a payback period is determined.