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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 avoid duplication. 'Once and only once' is the Extreme Programming phrase.
-- Martin Fowler
DRY ‐ Don't Repeat Yourself ‐ Every piece of knowledge must have a single, unambiguous, athoritative representation within a system.
-- Andy Hunt and Dave Thomas
Be careful to preserve the orthogonality of your system as you introduce third-party toolkits and libraries. Choose your technologies wisely.