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Key Concepts in Accurate Measurement: Reliability


Reliability is the degree of confidence that both scores and student performance are repeatable over time and across different circumstances. Repeatability of scores means that the same student response will receive the same score(s) no matter who scores the assessment or when it is scored. For example, different scorers or the same scorer at different times should assign the same score(s) to the same piece of student work (O’Neill & Stansbury 2000).