For the ValiDiS project, the interpretation of the test score of a multiple-choice test for scientific reasoning (the Ko-WADiS-test) is examined, taking into account the validity criterion relations-to-other-variables. In order to investigate the empirical relation of the test score with deductive reasoning (verbal, numerical, figurative intelligence, I-S-T 2000 R) and complex problem solving (systematic exploration, system knowledge, control performance, Genetics Lab-test), established assessment instruments were used to obtain test scores of pre-service science teachers (N = 232). There are positive, mostly significant correlations with medium effects, which supports the assumption that they are distinct constructs with linking facets. In addition, there is a positive correlation between the test score and the final grade. In this contribution, the findings are discussed as evidence for a valid test score interpretation of the Ko-WADiS-test.
