自1993年ISO出版物《测量不确定度表示指南》（GUM）问世以来，许多计量从业者已经意识到其局限性，该指南已经指出了这一点。该指南旨在用于一般用途，但不满足辐射测量、分布传播、多重输出等特殊要求。因此，CIE在2001年的研讨会上专门讨论了这个热门话题，并于2001年1月23日和24日在奥地利维也纳的CIE中央局举行了一次研讨会。组织了两个部分:•不确定性评估进展•关键比较和相互承认安排。 第一部分中的论文主要使用了不确定性的理论方法，其中包括从光谱和中得出的量的不确定性、色度学中的数值方法、具有多个输出量的模型中的不确定性、光度测量中的相关性和树胶补充剂。第二部分主要基于关键比较框架内光度和辐射测量的实际实施。在BIPM关键比对数据库、关键比对参考值的客观性、光子计数中的启发式和最优估计器以及不同国家测量实验室光度测量的评估上阅读论文。 会议记录包含了长达83页的九篇论文以及讨论报告。

Since the appearance of the ISO publication "Guide to the expression of uncertainties in measurement" (GUM), in 1993, many practitioners in metrology have realised its limitations already indicated in the guide. The guide was intended for general use, special requirements like that of radiometry, propagation of distributions, multiple output, etc. are not met by it. Therefore, CIE dedicated its 2001 Symposium to this hot topic and held a symposium at the CIE Central Bureau, Vienna, Austria, on the 23 and 24 January 2001.Two sections were organized:•Advances in Uncertainty Evaluation•Key Comparisons and the Mutual Recognition Arrangement.Papers in the first section used mainly theoretical approach to uncertainty and among others dealt with uncertainties of quantities derived from spectral sums, with numerical methods in colorimetry, with uncertainties in models having more than one output quantity, with correlations in photometric measurements and with GUM supplements. The second section was based on the practical implementation of photometric and radiometric measurements mainly in the frame of key comparisons. Papers were read on the BIPM key comparison database, on the objectivity of key comparison reference values, on heuristic and optimal estimators in photon counting and on the evaluation of photometric measurements in different national measurement laboratories.The Proceedings contain on 83 pages the text of the nine papers read as well as reports on the discussions.