A multidimensional item response theory (IRT) model for polytomously scored items, based on the graded response model and using the normal ogive, is developed; and an EM algorithm that may be used to estimate the parameters of the model is also discussed. The model is illustrated through a simulation study in which the polytomous item responses of…

The contributions and limitations of computer technology in the presentation of grammar drills, particularly in a second language, are examined by comparing and contrasting the new technology with traditional textbook instruction. It is noted that, in many ways, computer-assisted language learning (CALL) is a derivative form of traditional…