This paper describes the stepwise life cycle engineering methodology for the clean design of large made to order (LMTO) products under development at the Engineering Design Centre, University of Newcastle upon Tyne, UK. LMTO products, such as offshore platforms, ships and power stations, have particular environmental implications due to their size, cost, long life spans, high public visibility and their potential for ecological/civil disaster. The methodology uses a stepwise approach to apply life cycle costing, life cycle assessment (environmental impact estimation) and risk assessment to an inventory model of the product. Both the inventory model and the analyses increase in complexity as the design progresses. The methodology extends the LMTO product life cycle model to include a long-term 'legacy' phase to address the intergenerational equity principle of sustainable development.
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