Grosz, B. J. (1977, August). The representation and use of focus in a system for understanding dialogs. In IJCAI (Vol. 67, p. 76).
As a dialog progresses, the objects and actions that are most relevant to the conversation, and hence in the focus of attention of the dialog participants, change. This paper describes a representation of focus for language understanding systems, emphasizing its use in understanding task-oriented dialogs.