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Investigating the Dimensionality of an Admission Specific Purpose Language Test

The present study examines the dimensionality of an admission language test for Accounting in which general and specific purposes language components are measured in a de-modularized version. The question is that whether items assembled in one subset in such complex tests contributed only to a simple structure (measuring a single trait) or to a complex one (with each item set measuring more than one latent ability) and whether through some modifications in item assembly sub- layer of test architecture, the upgraded item -sets could represent the true dimensionality of the test, hence meaningful part-scores for each set. To this end, two consecutive phases ordered the progress of the research of which the first one is a dimensionality decision phase and the second one is the model recovery. The results showed that the concerned test violates the assumption of unidimensionality from both psychometric and psychological perspectives and therefore, items should be calibrated under some higher-dimensional model conditions. This research has implications for any testing situation where testing agencies in the rush to implement comprehensive accountability systems may be trapped in the chaotic domain of multi-objective, multi-purpose tests.