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Did you know that a challenge from a student triggered John Little to create Little's Law? Did you know it didn't start with him? Read more!

Little's Law is an equation that relates three basic metrics of flow. As in equal. Not approximate. But it isn't that simple in reality.

Flow metrics are meaningless unless we know what data we need to capture to calculate them - like start and finish dates.

As much as Flow is talked about in Lean-Agile circles, there really aren't many reliable definitions for what Flow actually is.