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Random is not Unique

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Thoughts and ramblings mostly concerning Performance Testing. Odd title? Consider the source... Random is not Unique. I've seen it in other industries as well, when results don't quite come out the way you expect, and when you find the cause, you eventually find duplicates because you are choosing parameters randomly rather than uniquely. A beginner's mistake? Not always... sometimes just a mistake, but sometimes based on a misconception about what Random really does. But it's random and random is random - it chooses a different number every time right? No, it's just random. If you role a 6-sided die 6 times, what happens? That's random. If you put 6 numbers in a hat and remove them one at a time (without putting any back), that's unique.