Question

Define daily promotion and demotion in the context of partial order planning

Answer 1

Partial-order planning is an approach to automated planning that maintains a partial ordering between actions and only commits ordering between actions when forced to. By contrast, total-order planningmaintains a total ordering between all actions at every stage of planning. Given a problem in which some sequence of actions is required in order to achieve a goal, a partial-order plan specifies all actions that need to be taken, but specifies an ordering between actions only where necessary.

Consider the following situation: a person must travel from the start to the end of an obstacle course. This obstacle course is composed of a bridge, a see-saw and a swing-set. The bridge must be traversed before the see-saw and swing-set are reachable. Once reachable, the see-saw and swing-set can be traversed in any order, after which the end is reachable. In a partial-order plan, ordering between these obstacles is specified only when necessary. The bridge must be traversed first. Second, either the see-saw or swing-set can be traversed. Third, the remaining obstacle can be traversed. Then the end can be traversed. Partial-order planning relies upon the Principle of Least Commitment for its efficiency.


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