The system's dynamic control planning is its means
of preserving coherence. Although all the reasoning and interactive
processes run in parallel, the current
control plans are universally
accessible, providing some global coherence. The preprocessors apply perceptual filters in accordance with the
current plans' demands for selective
attention. The plans also subject the output drivers to performance constraints.
Most importantly they determine operations placed on the agenda and the operation finally scheduled. However, maintaining coherence
in light of multiple, simultaneous goals would
seem to be an important issue.
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