Weinberg's Law of Twins

Weinberg's Law of Twins states that most of the time, no matter how much effort one expends, no event of any great significance will result. Weinberg's Law of Twins Inverted states that occasionally—particularly when one isn't expecting it—a significant event occurs.  Gerald Weinberg invented the law and described it in his book The Secrets of Consulting (1986), in which he explains the origin of its name.
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