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<p>Flight itinerary planning is viewed as constraint satisfaction. Interactive constraint-based problem solvers must address two basic issues simultaneously and effectively: first, eliciting individual problem constraints; and second, given the constraint set, generating a solution. Globe-Trotter's dialogue management scheme addresses both issues. A system overview of Globe-Trotter is given. The system's knowledge base structure and contents, reasoning system, and the itinerary generation process are examined. Related work and future plans are briefly discussed.</p>

G. Biswas, T. A. Linden, A. M. Rao Padala and P. K. Bose, "Globe-Trotter: An Intelligent Flight Itinerary Planner," in IEEE Intelligent Systems, vol. 4, no. , pp. 56-64, 1989.
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