In previous research, no relationship was found be tween test factor structure and test hierarchical struc ture. This study found some correspondence between test factor structure and test inter-item dependency structure, as measured by a log-linear model. There was an inconsistency, however, which warrants further study: More significant two-item interactions were found for the set of items that had been found to be most heterogeneous by latent trait techniques, rather than for the more homogeneous set of items.
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