ROSISTEM
Logistics Education » Automation & Robotics Education » Goods-to-Person vs Person-to-Goods Automation

Goods-to-Person vs Person-to-Goods Automation

One of the most consequential decisions in warehouse design is whether workers travel to inventory (person-to-goods) or inventory travels to workers (goods-to-person). This single choice shapes labor productivity, building layout, and the entire automation investment strategy.

Person-to-Goods: The Traditional Model

In a person-to-goods (PTG) operation, a picker walks or rides through the warehouse to each storage location required by an order, retrieves the item, and moves to the next location. This is the default model in most conventional warehouses and requires no special automation — only accurate location data, clear labeling, and efficient pick paths.

The major cost driver in PTG is travel time: studies of manual picking operations consistently show that a large share of a picker's shift is spent walking rather than picking. Slotting optimization, batch picking, and zone picking are common software-driven techniques to reduce this waste without introducing hardware automation.

Goods-to-Person: Bringing Inventory to the Worker

In a goods-to-person (GTP) operation, automation — AS/RS, VLMs, carousels, or AMRs carrying shelving pods — delivers the required inventory directly to a stationary picking station. The operator no longer travels; they simply pick from whatever unit arrives and confirm the pick, often guided by a put-to-light or pick-to-light display.

Person-to-Goods Worker walks to inventory Goods-to-Person Station Inventory travels to worker
Comparing the Two Models
  • Labor productivity — GTP typically yields substantially higher picks-per-hour per operator since travel time is eliminated.
  • Capital cost — GTP requires significant upfront automation investment; PTG requires minimal capital.
  • Flexibility — PTG scales labor up or down easily for seasonal peaks; GTP throughput is capped by the number of automated units and stations unless additional hardware is added.
  • Space utilization — GTP systems (especially AS/RS-based) generally achieve much higher storage density than conventional PTG racking.
Choosing Between Them

The decision depends on order volume, SKU count, labor cost and availability, and expected growth. High-volume, stable operations with many small-item SKUs (typical of e-commerce) often justify GTP's capital cost through labor savings. Lower-volume or highly seasonal operations, or those with large, bulky items unsuited to automated storage, often remain more economical with a well-optimized PTG model. Many large facilities use both models side by side — GTP for fast-moving small items, PTG for bulky or slow-moving SKUs.