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Preferences can be regarded as soft constraints on a plan. The quality of a plan increases when more preferences are satisfied but it may not be possible to satisfy all preferences in a single plan. This differs from hard constraints which must be satisfied in all plans produced by the planning software. These hard constraints are part of the ___domain knowledge while the soft constraints (or preferences) are separately specified by the user. This allows the same ___domain knowledge to be reused for various users who may have different preferences.
The use of preferences may also increase the length of a plan in order to satisfy more preferences. For example, when planning a journey from home to school, the user may prefer to buy a cup of coffee along the way. The planning software could now plan to visit
== Planning Domain Definition Language ==
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