Abstract: One of the critical factors contributing to the effectiveness of
human tutoring is the conversational aspect of the instruction. Our goal is to
develop a general model for supporting dialogues with menu-based input that
could be used in both well- and ill-defined instructional tasks. We have
previously studied how human tutors provide additional support to students
learning with an existing intelligent tutoring system. On the basis of these
findings we developed a model for supporting dialogues, which we present in
this paper. We used this model in a Wizard-of-Oz study to provide adaptive
support. The results show that students did learn the relevant domain knowledge
and that human tutors mostly agreed with the interventions generated from the
model.