Results of single- and two-dimensional audit experience with customers, an alternate map approach

Measurement Assurance Programs (MAP's) available from the National Bureau of Standards (NBS) are well-known methods of transferring physical and electrical values. However, where accuracy requirements are moderate it is not often practical to make use of these elegant techniques. In the broad definition sense MAP includes any technique by which the quality of measurements may be assured. Audit of measurement capability can fill the need for many lower accuracy requirements. Described are philosophies and types of audits. Also described are the results of eight years of technical audit of 11 laboratories using single- and two-dimensional length artifacts. Modifications to length audit philosophy to meet requirements of new computer-operated measuring equipment are briefly presented.