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This commentary appraises the 2009 special issue of Language Assessment Quarterly on “Cognitive Diagnosis and Q-matrices in Language Assessment.” Despite a number of weaknesses, specifically in attempting inappropriately to retrofit a suite of proficiency tests to diagnostic purposes, the special issue is seen as a landmark in the development of our understanding of the need for research into diagnostic language assessment.
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J. Charles Alderson (2010) studied this question.
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