@inbook {1894, title = {Up-and-down procedures for approximating optimal designs using person-response functions}, year = {2007}, note = {{PDF file, 1,042 KB}}, address = {D. J. Weiss (Ed.). Proceedings of the 2007 GMAC Conference on Computerized Adaptive Testing.}, author = {Sheng, Y. and Flournoy, N. and Osterlind, S. J.} }