ABSTRACT
FLUENT, a complex, conversational intelligent CALL (ICALL) system, presents many design options for tutorial strategies. The objective of the FLUENT project is to provide one essential form of foreign language learning experience: conversation in the target language, uninterrupted by discussions of grammar, use of first language, and difficulties of other students. A micro-world is an internal representation of the objects, actions, and plans that permit events to happen. The subject matter of all the two-medium conversations in FLUENT is organized into micro-worlds. The dialogues that occur within a micro-world are made up of moves, or basic communicative acts. To organize the move structure of the dialogues, we introduce the interaction type. An interaction is a short sequence of specified kinds of linguistic and spatial moves by the tutor and student. Choosing an interaction type determines, among other things, whether it is the tutor or the student who momentarily takes the initiative.
