TY - CONF T1 - a-stratified CAT design with content-blocking T2 - Paper presented at the Annual Meeting of the Psychometric Society Y1 - 2001 A1 - Yi, Q. A1 - Chang, Hua-Hua JF - Paper presented at the Annual Meeting of the Psychometric Society CY - King of Prussia, PA N1 - {PDF file, 410 KB} ER -