Reliability

From EvaluationWiki

The extent to which two measurements or evaluations of the same entity give the same results. The measurements or evaluations, usually judgmental, are either done in the same way but at two different times (this yields 'test-retest reliability'), or by two different evaluators or techniques, in which case the term used is 'interjudge' reliability, though it may be an instrument rather than a person that is reporting conclusions. Usually reported as a simple correlation coefficient.