However, in the context of spoken dialog system for domain-specific tasks, this framework must solve two problems: (1) Keeping track of the dialog state with a view to ensuring steady progress towards task completion, (2) Supporting n-best recognition hypotheses to improve the robustness of dialog manager.
we sought to solve these prob- lems by integrating the agenda graph as a heuristic which reflects the natural hierarchy and order of subtasks needed to complete the task.