抄録
What kind of dialogue between a learner and an ITS has the field of ITS sought to realise? We survey the short history of ITS studies, focussing on the aspect of dialogue, highlighting four necessary conditions for a learner to successfully learn from an ITS. As a result of this study, we have identified two key factors which undelie and support these four conditions. One is the learner's model of ITS. The other is the belief that "the knowledge should be directly transported from the system to the learner" .
