A simple score test of the normal two-parameter logistic (2PL) model is presented that examines the potential attraction of the normal three-parameter logistic (3PL) model for use with a particular item. Application is made to data from a test from the Praxis series. Results from this example raise the question whether the normal 3PL model should be used routinely in preference to the normal 2PL model unless evidence exists that a substantial gain in description of data is achieved.