![]() Irrespective of the number of variables children were allowed to set, experiments validly measured CVS use. ![]() The analysis showed it was possible to assess CVS use in a reliable and valid manner with the new assessment tool. There were two scores of CVS use: experiment and variable correct score. In this task, the children were challenged to design experiments using two ramps with up to four independent variables: weight of the ball, steepness of the slope, place of the starting gate, and surface texture of the slope. A commonly used, hands-on, experimentation task was adapted to dynamically assess the use of the so-called control of variables strategy (CVS) by children 4 to 6 years of age. Scientific reasoning is one of the learning processes happening within science education. ![]() A dynamic assessment tool was developed and validated using Mokken scale analysis to assess the extent to which kindergartners are able to construct unconfounded experiments, an essential part of scientific reasoning.
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