Chang, S. - W. (1998). A comparative study of item exposure control methods in computerized adaptive testing. Unpublished doctoral dissertation, University of Iowa , Iowa City IA.

Chang, S. - W., & Twu, B. - Y.. (2001). Effects of changes in the examinees’ ability distribution on the exposure control methods in CAT. In Paper presented at the annual meeting of the American Educational Research Association. Seattle WA.

Chang, S. - W., & Harris, D. J.. (2002). Redeveloping the exposure control parameters of CAT items when a pool is modified. In Paper presented at the annual meeting of the American Educational Research Association. New Orleans LA.

Chang, S. - W., & Ansley, T. N.. (2003). A comparative study of item exposure control methods in computerized adaptive testing. Journal of Educational Measurement, 40, 71-103.

Chang, S. - W., & Twu, B. - Y.. (1998). A comparative study of item exposure control methods in computerized adaptive testing. Research Report Series 98-3, Iowa City: American College Testing.