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4:00pm, Adamson Wing, Baker Hall
In practice, planning and scheduling is rarely (if ever) a one-shot generative task aimed at satisfying pre-specified constraints and objectives. It is an iterative (and ongoing) process, concerned concurrently with (1) building understanding of the evolving problem and execution state, (2) determining what the constraints and objectives are (or should be), and (3) generating and maintaining an acceptable solution. Despite this fact, most current planning and scheduling systems are based rigidly on a "specify and solve" model of user-system interaction, where the user specifies problem inputs and constraints up-front, and the back-end problem solver is then invoked to generate a solution. This model of interaction does not match the requirements of the larger planning and scheduling process. There is no persistence of decisions over time, no ability to control how solutions change in response to changed inputs or constraints, and no ability to converge to and maintain an acceptable solution in an incremental, controlled manner.
A better framework for user-system interaction follows from a view of planning and scheduling as an incremental change process. This is the approach taken in the design of Ozone, a configurable framework for mixed-initiative scheduling and planning under continuing development at CMU. Within Ozone, incremental constraint-based problem solving techniques are combined with graphical solution visualization and manipulation techniques to provide a flexible, "spreadsheet-like" planning and scheduling model. The user analyzes solution elements and formulates change directives from aggregate task-oriented perspectives; the system manages the details of implementing change directives in accordance with user goals and expectations. The Ozone framework has been applied to develop application systems in a range of complex planning and scheduling domains, most notably the Ditops transportation scheduler. In this talk, I will summarize the technical basis of this mixed-initiative problem solving framework, demonstrate current capabilities, and describe current research, application and technology transition efforts.
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