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Why should a performance measure describe outcomes rather than behaviour?

  • A.Prescribing behaviour prevents the agent finding a better way
  • B.Behaviour is harder to observe than the resulting outcome
  • C.Outcomes are always easier to measure than actions taken
  • D.Regulations require that systems be specified by their outputs

Answer: A

Telling a cleaning agent to sweep rewards sweeping rather than cleanliness, and an agent may sweep dirt about indefinitely, whereas rewarding a clean floor leaves it free to find the best method. Measuring outcomes is often harder rather than easier, and regulation is not the reason. Specifying what is wanted rather than how to achieve it is the principle behind declarative specification generally, and its violation is behind many of the field's more entertaining failures.

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