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Why are planning and scheduling often solved separately?

  • A.Each is well served by different specialised techniques
  • B.Solving them together would produce an incorrect result
  • C.Scheduling cannot begin until execution has started
  • D.The two problems concern entirely different domains

Answer: A

Causal reasoning suits a planner and numeric temporal reasoning suits a constraint or linear solver, so a plan is generated and then scheduled, with feedback if the schedule is infeasible. Solving jointly is possible and sometimes better but far harder. Correctness, timing and domains are not the reason. Decomposing a problem along the boundary between two mature technologies, and iterating between them, is a pragmatic architecture that appears throughout operations research.

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