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is essentially a measure of consistency. Reliability can exist in the absence of validity, but the interpretation of data cannot be valid if the data are not reliable. Furr and Bacharach (2008) define reliability as, “the extent to which differences in individuals’ scores produced using an evaluation instrument are consistent with differences in their true abilities” (p. 82). For performance evaluation, three types of reliability include inter-rater reliability, intra-rater reliability and inter-instrument reliability.
refers to, how well theory and evidence support the way evaluation scores are used (AERA, APA & NCME, 1999).