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What is goods placement?

Goods placement describes the decision of which item is stored at which storage location. This is not simply a matter of putting goods away once, but rather a comprehensive strategy that takes into account access frequencies, weight and hazardous materials requirements, temperature ranges, and the structure of storage and picking zones. Goods placement directly influences how long pickers spend traveling for an order, the error rate during picking, and how well the available storage space is utilized.

Strategies and methods in practice

In practice, several approaches can be distinguished, each suited to different assortment sizes, turnover frequencies, and levels of automation:

• ABC classification: Fast movers (A-items) are placed in ergonomically favorable, route-optimized picking zones, while slow movers (C-items) are stored further away or in reserve areas. This principle is widely used, but is only effective when the classification is reviewed and updated regularly.
• Rule-based placement: Items are assigned to specific storage zones based on fixed criteria such as hazardous materials class, minimum temperature, maximum weight, or batch requirements. These rules are often mandated by law or quality assurance requirements.
• Dynamic slotting: Software-driven methods continuously analyze movement data and suggest relocations when sales patterns change. This is particularly relevant for seasonal assortments or frequently promoted items.
• Chaotic storage: No fixed storage location is assigned per item; the warehouse management system dynamically assigns a free slot at the time of putaway. The placement logic resides entirely within the system, enabling high space utilization.

Which method makes sense depends, among other things, on how quickly the assortment turns over, how large the SKU count is, and whether a WMS with the corresponding slotting functionality is available.

What matters when selecting and implementing a solution

A common mistake is to optimize goods placement once and then never adjust it again. Especially with growing assortments or changing customer ordering patterns, a zone structure that was defined at a single point in time quickly becomes outdated. For this reason, the planning phase should already define at what intervals re-slotting takes place and who is responsible for it.

It is also important to distinguish between goods placement and the operational putaway process: the goods placement strategy defines where an item fundamentally belongs. The individual putaway process then implements this specification in day-to-day operations. Both levels must be consistently mapped in the WMS so that picks are guided correctly and inventory discrepancies are minimized.

When procuring slotting software or reorganizing storage zones, it is worthwhile to measure actual travel times and picking frequencies in advance rather than relying on estimates. The functional scope of slotting modules varies considerably between vendors — a comparison based on concrete requirements is more meaningful than relying on general market overviews.