Step 2. Item selection
Many item selection rules have been proposed for CAT. Maximum Fisher information (BIRNBAUM, 1968) is most commonly applied, but Fisher interval information (VEERKAMP; BERGER,1997), Kullback-Leibler information (CHANG;YING, 1996; VELDKAMP; VAN DER LINDEN, 2002), or mutual information (WEISSMAN, 2007) might be applied as well.