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.

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Quote text and notes from Wikiquote: Martin Fowler (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.