Abstract
Logical Test Design (LTD) is a technique for developing test items that evaluate procedural learning. This research investigated the ability of LTD to predict student performance in reading Roman numerals. The study (a) compared item structural properties identified by LTD with item size and expert judgment, in their ability to predict item difficulty, and (b) investigated the consistency of students' performance on item pairs varying on their LTD structural similarity. Two hundred and eleven sixth-grade students were tested on Roman numeral items varying on LTD-related and LTD-non-related variables. An LTD-related variable, item iterativity, the number of iterations through the algorithm for decoding a Roman numeral, was found to be the best predictor of item difficulty. Furthermore, item association, the proportion of students that consistently performed correctly or incorrectly on any two items, was greater for those items identified by LTD as structurally equivalent. However, that expert judgment, almost independently of iterativity, predicted difficulty about as well, suggested a cognitive component not captured by the model. Strengths and limitations of LTD for test development are discussed.
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