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![Cover for Rudiger Grotjahn · Tasks and Criteria in Performance Assessment: Proceedings of the 28th Language Testing Research Colloquium - Language Testing and Evaluation (Paperback Book) [New edition] (2009)](https://imusic.b-cdn.net/images/item/original/163/9783631584163.jpg?rudiger-grotjahn-2009-tasks-and-criteria-in-performance-assessment-proceedings-of-the-28th-language-testing-research-colloquium-language-testing-and-evaluation-paperback-book&class=scaled&v=1511872334)