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The Throughput form of Little's Law is based on five basic assumptions. Break any of those, and the equation doesn't work. Simple as that.

Geologists fall prey to the same syndrome that afflicts most Agile methodologies. A bias toward finish while ignoring the start.

Why is the standard deviation so popular? Not because it is correct. Because that's what students are taught. It's that simple.

Little's Law's two forms can lead to two very different answers even when using the same dataset. How can one law lead to two answers?