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{{see also|Open/closed principle}}
The '''protected variations''' pattern protects elements from the variations on other elements (objects, systems, subsystems) by wrapping the focus of instability with an [[Interface (computer science)|interface]] and using [[Polymorphism (computer science)|polymorphism]] to create various implementations of this interface.
Problem: How to design objects, subsystems, and systems so that the variations or instability in these elements does not have an undesirable impact on other elements?<br>
Solution: Identify points of predicted variation or instability; assign responsibilities to create a stable interface around them.
===Pure fabrication===
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