Picking methods: batch, zone and wave

Order picking is the most labour-intensive job in a warehouse: pickers spend most of their working time walking and taking items off shelves. Choosing the right method can raise speed noticeably without adding headcount. Below we look at four methods from simple to complex and say which one suits which warehouse.

Single-order picking: one worker, one order

This is the simplest approach: the worker takes an order sheet and picks it from start to finish alone. The advantages are clear: it is easy to understand, errors are few, and you know who is responsible for each order. The weakness shows as orders grow: over a day the worker walks the same aisles dozens of times. The method suits a small warehouse that picks around thirty orders a day.

Batch picking

In this method several orders are picked in one trip and the items are totalled by product. For example, each of ten orders contains "cable 2x1.5". With single-order picking the worker goes to that shelf ten times; with batch picking they go once, take ten, and then split them into orders on a sorting table.

The gain is large: walking drops sharply. There is a risk too: a sorting step appears and items can get mixed up. Limit the batch size: put more than ten orders on a cart and they get mixed up. The method works well when there are many orders but each has only one or two lines. Warehouses serving online shops and Telegram sellers often see exactly such orders.

Zone picking

The warehouse is divided into zones and each worker stays in their own. The order moves from zone to zone on a cart or conveyor, or is picked in the zones in parallel and combined afterwards. The worker knows their zone's goods well and the aisles are less crowded. Assign people to zones according to load: the busiest zone can get two workers. It is also convenient to divide zones by storage conditions: in a pharmacy warehouse the refrigerated zone is separate from the ordinary one.

The drawback: overall speed is set by the slowest zone, and it is hard to spread the load evenly across zones. Because an order passes through several hands, it is also harder to tell where an error occurred. The method suits large warehouses with a wide range.

Wave picking

In wave picking, orders are grouped by time and released for picking at set moments. Waves are usually tied to transport departure times. For example, waves at 10:00, 14:00 and 17:00, each of which must be ready for its own trip. As a result the workload is planned in advance and fits in with the dock and truck schedule.

The difficulty is that an order arriving after a wave closes goes into the next one, and planning needs more attention. The method suits warehouses with fixed trips and dispatch deadlines for marketplaces.

Which method to choose

The answer depends on three factors: the number of orders, the number of lines per order and the size of the warehouse.

• Few orders, few lines, a small warehouse: single-order picking.
• Many orders, few lines, repeating products: batch picking.
• A large warehouse with goods stored in different conditions: zone picking.
• Trips leave strictly on a timetable: wave picking.

In practice the methods are often combined: zone with wave, or batch picking within a zone. Do not choose once and for all; if volume changes, review the method.

Also consider what has to be prepared in advance for each method. Batch picking needs a sorting table and a cart with several separate bins, each marked with an order label. Zone picking requires a handover point between zones and a clear boundary. In wave picking the system must group orders by time, and the hour a wave closes must be known to everyone. Whichever method you choose, picking with a scanner noticeably reduces errors.

Conclusion

The picking method is chosen according to warehouse size, order structure and trip schedule; there is no universal "best" one. During a warehouse audit, SkladKontrol observes your current picking and helps determine which method suits your orders better.