If a collection of experimental **data** to be evaluated can be organized into two or more groups, based on distinct experimental techniques employed in the measurements, and if evaluation of these **data** groups separately, according to the various group characteristic experimental techniques, produces noticeable differences in both the evaluated mean values and uncertainties for the distinct groups, this is strong evidence for the existence of a method-related bias attributable to USU that must be taken into consideration by an increase in the evaluated uncertainties.