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An essential qualityィ of an assessment is the extent to which it is valid, that is, that the assessment measures the content, skills and understanding that it sets out to measure in such a way that accurate and fair conclusions about performance can be drawn from its outcomes. According to Messick's (1989: 13) classic definition, validity is a multi-faceted but unitary concept: ‘Validity is an integrated evaluative judgement of the degree to which empirical evidence and theoretical rationales support ...

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