Considerations with regard to the calculation of key comparison reference values and uncertainties

Much has been published over the last years on finding the best (consensus) reference value for a given set of key comparison data, and a suite of approaches proposed. In this paper, several aspects are highlighted which should be taken into account when deciding on key comparison strategies, protocols, and the best approach to reliable key comparison reference value and uncertainty. Some of these aspects are briefly discussed. The paper is intended to intensify discussions, and any comments and opinions are welcome. Presented at the CCQM 2008 KCRV Workshop, April 2008, Sèvres, France. Papers published in this section do not necessarily reflect the opinion of the Editors, the Editorial Board and the Publisher.