Purchasers from public organizations increasingly use environmental impacts of products to inform their buying decisions. The EU Directive 2004/18/EC 'Coordination of procedures for the award of public works contracts, public supply contracts and public service contracts' allowed EU Member States to add sustainability criteria for awarding public projects. In order to facilitate the environmental performance calculations, a selection of tools have been developed. These tools consist of three elements - (1) front-end; (2) the calculation engine and (3) the products database. The front-end and calculation engine are usually combined. The most popular in the Netherlands are Green-calc+ for buildings and DuboCalc for civil works. These calculation engines are based on the European standard for environmental product declarations - EN15804.
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