5. Conclusions

In this article we have illustrated the methodological principles and a few applications of operational methods that enable us to assess uncertainty in the broad sense of LCA impact results, namely :

• variability, by propagating probability distributions using a Latin Hyper Cube algorithm;

• imprecision by means of interval calculation ;

• uncertainty in the strict sense through possibility theory and fuzzy logic.

With regard to this last point, we have illustrated a fuzzy noise impact assessment method capable of taking into account uncertainty in the strict sense intrinsic to the definition of impact.

In the current context, where the links between the economy and the environment are undeniably complex, facts are increasingly...