AbstractThe National Environmental Policy Act (NEPA) of 1969 provides the basic national charter for protection of the environment in the United States. Today NEPA provides an environmental policy model, emulated by nations around the world. Recently, questions have been raised regarding the appropriateness and under what conditions it makes sense to combine the preparation of a NEPA analysis with the International Organization for Standardization (ISO) ISO 14000 standards for Life‐Cycle Assessment (LCA). This article advances a decision‐making tool consisting of six discrete factors for use in determining when it is appropriate to perform an integrated NEPA/LCA analysis. Properly applied, this tool should reduce the risk that an LCA may be inappropriately prepared and integrated with a NEPA analysis.© 1999 John Wiley&Sons,