Distribute system intelligence horizontally as uniformly as possible, that is, the top-level classes in a design should share the work uniformly.
Do not create god classes/objects in your system. Be very suspicious of a class whose name contains Driver, Manager, System, or Subsystem
Beware of classes that have too much noncommunicating behavior, that is, methods that operate on a subset of the data members of a class. God classes often exhibit much noncommunicating behavior.
Cure:
Divide noncommunicating behavior into separate classes
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