1.the performance between D-optimality and KL information methods in multidimensional adaptive testing is still unknown.
the research about KL information had been published by the same authors
http://link.springer.com/chapter/10.1007%2F978-0-387-85461-8_4
2. applying those methods in unfolding model is still unknown. However, the improvement may be not significant compared to D-optimality.