Each of the three components carries a silent assumption. The arrival process assumes work can be described by a stable average rate plus a degree of burstiness, which fails when demand is driven by one-off events or strong seasonal shifts. The service process assumes clearing capacity stays roughly constant over the period of interest, which fails when staffing, equipment, or policy changes mid-stream. The scheduling rule assumes one consistent rule is applied, which fails when priorities are renegotiated case by case. A fourth, subtler assumption is that the waiting pool is large enough that individual items blur into a smooth flow; in a nearly empty system, single arrivals and single services dominate and the curve's smoothness is an illusion.
Learn MotionThe Jev Model: An Intuitive Overview
Assumptions and Where the Model Applies
The Conditions Hiding Behind the Components
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The loop we just built looks self-contained, but every part of it is quietly assuming something. Start with arrivals. The model treats them as a stable average rate plus some burstiness, and that description only holds if demand isn't being driven by one-off events or a strong seasonal swing.
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