ISO 9001, ISO 14001 and OHSAS 18001 have similar contents regardless of their different structures. They complement each other, but can be used independently. An organisation can get a high return on their investment by taking advantage of the similarities between the three standards and integrating their quality, environmental and OH&S management systems. Part 1 of this series sets out the requirements for such an integrated management system (IMS), using ISO 9001 as the basic framework. Jointly published by SAI Global and Oy Benchmarking Ltd.