. (1987). CATS, testlets, and test construction: A rationale for putting test developers back into CAT. Journal of Educational Measurement, 32, 185-202.
. (1987). Item clusters and computerized adaptive testing: A case for testlets. Journal of Educational Measurement, 24(3), 185-201.
. (1986). CATs, testlets, and test construction: A rationale for putting test developers back into CAT (Technical Report 86-71). Princeton NJ: Educational Testing Service, Program Statistics Research.
. (1983). Alternate forms reliability and concurrent validity of adaptive and conventional tests with military recruits. Minneapolis MN: University of Minnesota, Department of Psychology, Computerized Adaptive Testing Laboratory.