Part1. Development of Polytomous IRT Models. R. Ostini, M. Nering, New Perspectives and Applications. R. Hambleton, W. van der Linden, C. Well, IRT Models for the Analysis of Polytomously-Scored Data: Brief and Selected History of Model Building Advances. D. Thissen, L. Cai, R.D. Bock, The Nominal Categories Item Response Model. F. Samejima, The General Graded Response Model. G. Masters, The Partial Credit Model. D. Andrich, Understanding the Response Structure and Process in the Polytomous Rasch Model.
Part2. Polytomous IRT Model Evaluation. R.D. Bock, R. Gibbons, Factor Analysis of Categorical Item Responses. C.A.W. Glas, Testing Fit to IRT Models for Polytomously Scored Items.
Part3. Application of Polytomous IRT Models. C. Huang, R. Mislevy, An Application of the Polytomous Rasch Model to Mixed Strategies. A. Boyd, B. Dodd, S. Choi, Polytomous Models in Computerized Adaptive Testing. S. Kim, D. Harris, M. Kolen, Equating with Polytomous Item Response Models.