Measurement Quality Attributes

Accuracy

Measurement Accuracy is: closeness of agreement between a measured value, and the "true measured value" - a value that could be obtained by perfect measurement standards in perfect conditions. (See VIM 2.13, 2.11)

Precision

Measurement Precision is: closeness of agreement between measured values obtained by repeated measurements of the same or similar objects. (See VIM 2.15)

Resolution

Resolution has two interpretations. Resolution of a measurement process is: the smallest change in a quantity being measured that causes a perceptible change in the corresponding indication. (See VIM 4.14) Resolution of a displaying device (a measuring instrument readout) is: the smallest difference between displayed indications that can be meaningfully distinguished. (See VIM 4.15)

Repeatability

Measurement Repeatability is: measurement precision when the repeated measurements of an object are made using the SAME measurement system, measurement procedure, operator, in the same environmental conditions and over a short time period. (See VIM 2.20, 2.21)

Reproducibility

Measurement Reproducibility is: measurement precision when the repeated measurements of an object are made using any of a DIFFERENT measurement system, measurement procedure, operator, location, and environmental conditions. (See VIM 2.24, 2.25)

Traceability

Measurement Tracebility is: the property of a measurement result whereby the result can be related to a reference through an documented unbroken chain of comparisons, each of which contributes to the measurement uncertainty. (See VIM 2.41) The reference is usually, but not always, a measurement unit of the SI as maintained by a national metrology institute.

BackNext