Measuring the Environmental Performance of industry is an essential element in the movement to minimise the impact that industry has on the environment. There has been a significant increase in interest in this area over the last few years, however it is recognised that the available literature still tends towards the conceptual and theoretical and there is little practical advice for a business wishing to undertake environmental performance measurement. This project has concentrated on the practical development of tools and techniques for measuring environmental performance in a large, complex engineering company, using LucasVarity as an example. The portfolio discusses the general trends and approaches in environmental performance measurement, explains the specific aspects developed in practice and their results. Finally, the general conclusions for industry are discussed.