A pattern is an idea that has been useful in one practical context and will probably be useful in others.
Martin FowlerWhen you actually sit down to write some code, you learn things that you didn't get from thinking about them in modeling terms...there is a feedback process there that you can only really get at from executing some things and seeing what works
Martin FowlerNever in the annals of software engineering was so much owed by so many to so few lines of code
Martin Fowler