What is a pattern?
- a recurring design problem that occurs in a specific context whose solution can be re-used [POSAV1 p. 8]
- a 3-part rule giving a relationship between a context, a problem, and a solution [RTP p. 23]
- patterns are discovered general solutions to design problems that provide a language to share them between designers [HFDP p. 32]
- a pattern is a solution to a problem in context [HFDP p. 579]
A Design Pattern is a re-usable design solution for a given context and problem.