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Accuracy as a concept is widely used in metrology. It has undergone a historical development and is defined and used differently in different documents, communities and usage situations. Present existing definitions are sometimes not clear, not unambiguous and sometimes even not useful. This paper explains the difficulties regarding present definitions (section 3 and 4), throws a spotlight on present day use of the concept (section 5), clarifies the question if accuracy is a qualitative concept (section 6) and finally presents conceptual ideas and a proposal for a new wording of a sustainable definition for accuracy (section 7). This paper is intended to support the highly estimated work of JCGM WG2.

Accuracy – review of the concept and proposal for a revised definition