Inventory Slotting, Part 2: Best Practices

In our previous blog post, we pointed out how strategically optimized slotting in fulfillment centers contributes to multiple gains in operational efficiency. To realize these gains for yourself, you'll start by collecting and analyzing various data points about your inventory such as sales velocity, order frequency, size, weight, etc.

This inventory data will inform your slotting strategy moving forward – enabling you to slot all your SKUs in a layout that 1) shortens picking times and reduces the frequency of replenishment trips by providing sufficient space for extra stock (informed by sales and order frequency data), and 2) allows pickers to quickly and easily access them with limited bending, reaching, or equipment required (informed by product volume and weight).

In addition to those primary goals, there are additional "best practice" considerations that should be guiding your re-slotting decisions. Address the following aspects as early as possible to maximize the effectiveness of your slotting strategy:

Storage areas and product types

Do certain types of storage areas in your warehouse work better for certain product characteristics? Are changes to the warehouse's layout needed to truly benefit from re-slotting? For example, you may want to store paper products away from high-humidity areas, or reorganize the layout to promote better airflow.

Product cubic velocity and slot sizing

The product cubic velocity refers to the amount of units picked from a location, multiplied by the product's cubic dimensions. Accounting for the cubic velocity will ensure that the SKU's slot size and number of picking locations are optimized to reduce replenishment trips and overall congestion.

Safety

Consider how slotting changes may impact workplace safety. For example, are there SKUs that should be at lower levels or in forward pick areas instead of requiring ladders or forklifts?

The future

A lackadaisical approach to slotting is detrimental to overall throughput and efficient space utilization in your fulfillment center. To gain the benefits from slotting, the process needs to be addressed continually as product assortment or sales by product change. Prioritize slotting assessments in your warehouse operations to ensure that your facility is always running at peak efficiency.

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