ABSTRACT
Editor Introduction: This chapter shows how many of the models introduced in earlier chapters have been used to extend computerized adaptive testing (CAT) into situations involving polytomous test items. A comprehensive survey of both research-oriented and applied examples of polytomous CAT are provided. Many issues are discussed in this chapter, including exposure control, stop rules, and how to estimate trait location. Additionally, the authors outline how polytomous models have varied in their performance relative to dichotomously scored items.
