Why MRP fails in volatile markets
Material Requirements Planning was designed for stable demand environments. You forecast demand, explode BOMs, calculate material requirements, and order in advance. This works beautifully when demand is predictable. It fails spectacularly when demand is volatile — which is most of the time in modern manufacturing.
The result of forecast-driven planning in volatile markets: excess inventory of items nobody ordered and stockouts of items everyone wants. Expediting becomes the norm. The production schedule is fiction by Tuesday.
Demand-driven principles
- Pull, not push — production is triggered by actual consumption, not forecast
- Buffer management — strategic inventory buffers absorb demand variability
- Decoupling points — buffers placed at strategic points break the bullwhip effect
- Visible priorities — buffer status drives execution priority, not due dates alone
- Continuous adjustment — buffer sizes adapt to demand patterns automatically
Platform requirements for demand-driven planning
Demand-driven planning requires real-time visibility into inventory levels, consumption rates, and order status. When your MES, inventory, and sales modules share one database, the production planner sees actual consumption in real time, not last week's inventory snapshot. Buffer status updates with every stock movement. Priorities are always current.
The best plan is the one that adapts fastest. Demand-driven planning is not about predicting the future. It is about responding to the present.