The NRTEE has developed and tested decision rules for energy, waste and water intensity indicators. The work builds on the the development of principles and a framework on eco-efficiency indicators undertaken by the World Business Council on Sustainable Development and on a previous Feasibility Study by the NRTEE. The program focussed on translating the WBCSD principles and framework into the specific definitions and rules for the resource and material productivity elements of eco-efficiency and testing them for the standard applicability across business sectors. The indicators address two elements of eco-efficiency that are within the direct responsibility of a company. They do not address the issue of consumption.