The Construction of a Developmental Scale for Seriation

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Abstract
In this study the relationship between seriation tasks and number line comprehension tasks are reported. Subjects were 595 children from kindergarten and primary school grades 1 and 2. Three types of tasks were administered: six seriation tasks derived from Piaget's publications, six seriation tasks provided with irrelevant cues and number line comprehension tasks. With the use of the stochastic Mokken scale analysis, it was shown that a selection of six of the 12 original seriation tasks appeared to form a strong Mokken scale, which was invariant for different samples at the same point in time of test administration. The reliability of the items of the found scale and the predictive value of these items for number line comprehension, were equal to the values found with the original 12 seriation tasks. A strong relationship of r = .80 was found between the items on the constructed scale and the number line comprehension tasks administered three months after the test administration of the seriation tasks.