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They allow one to make use of the knowledge of past designers. Many design projects are confronted with similar problems that demand similar solutions. A design pattern is an abstraction of the best solutions for a particular class of problems. MVC or [[Model view controller triad]] is a classical example of design pattern. It was introduced 1980 in the [[Smalltalk programming language|Smalltalk]] system.
The book that introduced the ''term'' design pattern to software development, ''[[Design Patterns]]: elements of reusable object-oriented software'' (commonly shortened to ''GoF'') says:
:[Design patterns] solve specific design problems and make object-oriented designs more flexible and elegant, and ultimately reusable. They help designers reuse successful designs by basing new designs on prior experience. A designer who is familiar with such patterns can apply them immediately to design problems without having to rediscover them.
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