Specialists do plan selection in order to affect the flow of control. Different plans
will produce different sequences of actions. Plan selection depends on three types of
information: the qualities of the plans themselves, the initial demands of the user
(requirements) and the situation in which the selection takes place
(i.e.,
the state of
the design and its history). We propose a general method of plan selection that
responds to all factors.
A designer may have very simple selection criteria, such as "if there is a plan that
hasn't been tried yet then try it", or they may be very complex. For example, "if there
are som ...
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