5. Our advice

5.1 Distinguish between elementary uncertainties

In the phase of evaluating elementary uncertainties, identify those which will have a very small impact on the final result, because their weight in the overall uncertainty is low. For example, when calculating the quadratic sum, (0.1) ² will be negligible compared with (0.9) ² . This observation can also be used to identify, on the contrary, a possible elemental uncertainty that is much greater than all the others. The final result will be very close to this uncertainty.