The authors propose a new Item Response Model which can be regarded as a leaner model. Unique features of this model are as follows:1.The model explains learners'solving process to test items.2.The parameters of this model can be divided into two kinds,namely,item parameters and incidental parameters.Learners'characteristics are described by the incidental parameters,i.e.,latent multidimensional variables.3.Learners'solving process is expressed in terms of the network,and the transition

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... ity is modeled by Markov Process.We apply this model to real data,and show that the parameters are estimated reliably and they reflect well the characteristics of the learners and items.