| Definition | A systematic review of the evidence of reliability and validity of assessment by teachers used for summative purposes (Harlen, 2004). Dependability of an assessment is the optimum relationship between its validity and its reliability. Since reliability and validity are not independent of each other - and increasing one tends to decrease the other - it is useful in some contexts to refer to dependability as a combination of the two. The approach to assessment of learning by teachers giving the most dependable result would protect construct validity, while optimising reliability. |
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