From the reviews:
"This is a collection of 22 chapters on research and development work on various extensions of the Rasch model. The single chapters are written by internationally recognized experts in the fields. Since the volume reflects the recent developments in the field it will be certainly a useful source up to date information. It will be certainly useful to the people working in educational research and social sciences." (Marie Huskova, Zentralblatt MATH, Vol. 1117 (19), 2007)
"This book, published in honor of the retirement of Jurgen Rost, is an edited volume of 22 invited chapters written by eminent researchers in the field of item response theory (IRT). The chapters are relatively accessible for a reader with a background in IRT and describe interesting and useful extensions to the familiar unidimensional Rasch measurement model (RM) to more complex multidimensional measurement and statistical models." (Allan S. Cohen, Journal of the American Statistical Association, Vol. 103 (481), 2008)