1. ISO 14040:1997. Environmental management—life cycle assessment—principles and framework.
2. ISO 14041:1998. Environmental management—life cycle assessment—goal and scope definition and inventory analysis.
3. ISO 14042:2000. Environmental management—life cycle assessment—life cycle impact assessment.
4. ISO 14043:2000. Environmental management—life cycle assessment—life cycle interpretation.
5. VDI 4600. Kumulierter Energieaufwand. Begriffe, Definition, Berechnungsmethoden.