ABSTRACT
This chapter seeks to highlight some of the unique types of item response theory (IRT) models that have emerged in support of computer-based testing (CBT). The multicategory scoring of many item types used in CBT are statistically improving measurement innovative item types has made polytomous IRT models of significant value in CBT. The polytomous IRT models are useful in evaluating the extent to which the innovative ciency. It is important to acknowledge other variants of testlet-based administration that can impact IRT modelling. The IRT models of increased relevance in CBT consist of multidimensional IRT models. In MIRT, item scores are modelled as a function of multiple person abilities. The diversity of IRT and IRT-related models needed for CBT has led to new thinking about how IRT models function within a broader assessment framework. The computer is offering much exciting future work within field of psychometrics for those who like to think creatively about the use of models in assessment contexts.
