@conference {880, title = {Effects of changes in the examinees{\textquoteright} ability distribution on the exposure control methods in CAT}, booktitle = {Paper presented at the annual meeting of the American Educational Research Association}, year = {2001}, note = {$\#$CH01-02 {PDF file, 695 KB}}, address = {Seattle WA}, author = {Chang, S-W. and Twu, B.-Y.} }