High Quality Content by WIKIPEDIA articles! The Archetype pattern separates the logic from implementation; the separation is accomplished by there being two abstract classes, a decorator (for logic) and a delegate (for implementation). The Factory handles the mapping of decorator and delegate classes and returns the pair associated with a parameter or parameters passed. The interface is the contract between a decorator, a delegate and the calling class creating a Inversion of Responsibility. This example use two branches however you can have `N` branches as required. The pattern means that one branch from the interface does not have to worry about how another branch operators as long it implements the interface.