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" "One of the things I've been trying to do is look for simpler or rules underpinning good or bad design. I think one of the most valuable rules is to avoid duplication. "Once and only once" is the Extreme Programming phrase.
Martin Fowler (born 18 December 1963) is a British software engineer, author and international speaker on software development, specializing in object-oriented analysis and design, UML, patterns, and agile software development methodologies, including extreme programming.
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It is commonly said that a pattern, however it is written, has four essential parts: a statement of the context where the pattern is useful, the problem that the pattern addresses, the forces that play in forming a solution, and the solution that resolves those forces. … it supports the definition of a pattern as "a solution to a problem in a context", a definition that [unfortunately] fixes the bounds of the pattern to a single problem-solution pair