Goods-to-person picking

How goods-to-person picking systems work

A goods-to-person (GTP) picking system is a warehouse automation solution that brings inventory directly to a stationary picker, rather than requiring the picker to walk through warehouse aisles to find products. Robots, shuttles, lifts, or carousels retrieve the required inventory and deliver it to a fixed workstation, where the operator picks the requested items into customer orders.davanti-wics.com+4

The core principle is simple: move the goods, not the person. This reduces walking and searching time while allowing pickers to focus on selecting the correct items, verifying quantities, and completing orders.

1. The process, step by step

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Step 1 — An order is released

The warehouse management system (WMS) identifies the required SKUs, quantities, inventory locations, and order priorities. It sends retrieval instructions to the automation control system.

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Step 2 — The system retrieves the inventory

A robot, shuttle, lift, or other retrieval mechanism locates the correct storage bin, tote, tray, or shelf and extracts it from storage.

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Step 3 — Inventory arrives at the picker

Conveyors, lifts, or mobile robots transport the inventory to a designated workstation. The operator receives on-screen instructions, often including the item and quantity to pick.

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Step 4 — The picker selects and confirms items

The operator takes the required quantity and places it into the correct order tote or carton. Scanners, weight checks, cameras, or pick-to-light indicators may help verify the selection.

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Step 5 — The inventory returns to storage

The source tote or tray is routed back to an available storage location, while the next required inventory container is delivered. The cycle repeats until the order or batch is complete.

This coordinated sequence is managed by software that tracks inventory locations, directs equipment movements, and keeps workstations supplied with the next items.davanti-wics.com+4

2. The main technologies that bring inventory to the picker

Different GTP systems use different mechanisms to retrieve and transport goods.

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A. Shuttle-based automated storage and retrieval (AS/RS)

Small motorized shuttles travel through storage racks to retrieve totes. Lifts and conveyors then bring the totes to the workstation.

Best suited for: high-volume operations requiring rapid, repeated retrieval of standardized containers.

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B. Cube-based robotic storage

Robots operate on a grid above densely stacked bins, retrieving the required bin and transporting it to a picking port. Some systems must move bins stacked above the target bin first.

Best suited for: high storage density and operations with many small-item SKUs.

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C. Autonomous mobile robots (AMRs)

Robots navigate the warehouse and carry storage pods, racks, or totes to the picker. Depending on the design, a robot may bring an entire shelf or just an individual container.

Best suited for: flexible layouts, changing inventory mixes, and warehouses that need to expand incrementally.

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D. Vertical lift modules (VLMs) and carousels

A VLM extracts a storage tray and presents it at an access opening. A carousel rotates shelves or bins until the required inventory reaches the operator.

Best suited for: compact parts storage, tools, electronics, pharmaceuticals, and smaller picking operations.

These architectures differ in storage density, retrieval speed, building requirements, flexibility, and investment cost.attabotics.com+2

3. What makes the system work as a whole?

GTP is not just a robot delivering a bin. It is an integrated material-handling and software system.

Warehouse management system (WMS)

Orders, inventory records, priorities and replenishment

Warehouse control / orchestration software

Assigns retrieval tasks, coordinates equipment, and manages queues

Retrieval equipment

Robots, shuttles and lifts

Transport equipment

Conveyors, buffers and transfers

Stationary picking workstation

Item presentation, order selection and pick confirmation

The most important operational detail is synchronization. If retrieval equipment delivers totes too slowly, the picker waits. If the workstation cannot process incoming totes fast enough, queues build up. Effective systems balance the retrieval rate, transport capacity, and human picking rate.attabotics.com+1

4. Key benefits and trade-offs

The biggest productivity gain comes from eliminating travel between storage locations. However, actual performance depends on the order profile, SKU mix, system design, and how well the workstation and automation are balanced.attabotics.com+2

5. A practical example

Imagine a warehouse fulfilling an order for two phone chargers, one headset, and three cables.

• A conventional picker walks to three storage locations to collect the items.
• In a GTP warehouse, the system retrieves the relevant bins and delivers them to the picker in sequence.
• The picker transfers the required quantities into the order container and confirms the picks.
• The source bins return to storage, and the completed order moves to packing or shipping.

One source bin may serve several customer orders during the same visit, provided the workstation has a way to direct each item into the correct order container. This batching can further improve productivity.attabotics.com+1

In summary: goods-to-person picking combines automated storage, robotic or mechanical retrieval, material transport, warehouse software, and a fixed ergonomic workstation. The technology removes much of the travel associated with traditional picking, allowing warehouse employees to spend more of their time performing productive picks rather than walking through aisles.