Welches Aufgabenformat ist das richtige?: Empirischer Vergleich zweier Aufgabenformate zur standardbasierten Kompetenzmessung

In 2005 educational standards for chemistry were implemented in Germany as an element of school development. The standards describe competencies students should achieve at a certain school level. The achievement is measured by test items. In a research project two different types of test items were developed based on a model of competence. This model describes content related item characteristics which are intended to have an influence on item difficulty. One type of items contains chemical content information which can be used to solve the task. The other type of items is identical but does not contain this information. On the basis of the probabilistic test theory the applicability of the two task types was analyzed. In total N = 1454 students from different German school types worked on the items. The results disclose advantages and disadvantages of both task types.