Abstract
A set of transitivity tasks was solved on two occasions by 634 2nd through 6th grade primary school children. Transitivity scales were constructed for both occasions using Mokken scale analysis. Combining the results, one final scale was constructed for use in future research. The order of the scale tasks according to their difficulty level was the same on both occasions. Analysis of the scale scores of one group retested after 16 weeks and two control groups revealed an absence of effects due to memorisation or test experience. It was concluded that the final scale is useful as a transitivity measure in longitudinal research.
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