This paper presents the International Iron and Steel Industry (IISI) Policy on LCA and describes how it has been applied to a major international project to produce life cycle inventory data for a wide range of steel industry products. This project was the first of its kind, having been conducted on a global scale. The resulting LCI data sets are used within the steel industry. An example of benchmarking is presented. The results are also provided to steel customers and other external audiences carrying out LCA studies, following an original procedure aimed at providing assistance and follow up.