Inventory planning: the second step in inventory management.

The key points

  • Inventory planning is the step between analysis and ordering: here you set targets and parameters per article class.
  • At the core of planning are target service level, safety stock and order rhythm per class from the ABC/XYZ analysis.
  • Planning happens at class level, not per individual article: that's what makes steering thousands of articles possible at all.
  • Without planning, ordering falls back on gut feeling and case-by-case decisions.

What is defined in inventory planning?

For each article class you define three things: the target service level (how available should the class be?), the safety-stock level (how much buffer does that justify?) and the order rhythm (continuously at the reorder point or in fixed cycles?). These specifications are the levers that later steer every single order.

Why do you plan at class level?

Nobody maintains targets for 8,000 individual articles. The classes from the ABC/XYZ analysis bundle articles with similar behaviour. You plan nine classes instead of thousands of articles, and the rules are inherited automatically by every article in them. New articles inherit their class's rule, without manual work.

How often must the planning be revised?

The classification turns over, and so does the planning. At least quarterly, class assignment and targets belong on the test bench: an article that has moved from CZ to AX needs a different target. In an ongoing operating model this happens as routine, not as a project.

The most common planning mistake is a blanket service-level target for the whole warehouse. Why that gets expensive is in the article on service level.

How much liquidity is tied up in your warehouse?

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