The following article was published in JCAT on December 24, 2013:

A Comparison of Four Methods for Obtaining Information Functions for Scores From
Computerized Adaptive Tests With Normally Distributed Item Difficulties and Discriminations

By Kyoko Ito and Daniel O. Segall

A PDF file of the complete article can be downloaded from http://www.iacat.org/jcat/index.php/jcat/article/view/22