Diagnose whether a queue delay is caused by arrivals, service time, or hidden work-in-process.
The Teach Little's Law turns a line from a mood into a measurable operating system. The formula is simple: average number in the system equals average arrival rate multiplied by average time in the system. In a theme park, this can describe guests in a ride queue, orders waiting at a food stand, strollers waiting at rental return, or vehicles waiting at the parking toll plaza. The power of the model is that it separates three different problems that look the same from the midway. If arrivals surge, the line grows even when the crew is performing well. If service…
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