First choose how the orders will move. Then choose how workers will be guided.
These are two separate choices. For example, a multi-order cart is a picking method; paper, a scanner, voice, or lights can all guide that cart. Keeping the choices separate makes comparison easier.
Not sure about a term? Open the plain-English glossaryEight options compared using the same questions
These are Warehouse Workflow Lab starting judgments used to create a shortlist—not measured performance claims or promises. Your required checks, labels, noise, gloves, Wi-Fi, product size, layout, workers, and problem-handling rules can change the answer.
Voodoo Robotics sells wireless light-directed systems. The same questions are used for every option, and the interactive tool lets you change the importance of each question.
| Question | Paper | Handheld barcode scanner | Wearable barcode scanner | Voice headset | Fixed wired location lights | Wireless location lights* | Camera / vision guidance | Mobile-robot assisted |
|---|---|---|---|---|---|---|---|---|
| Support for confirming the correct item or location | Low | High | High | High | High | High | High | High |
| Can the worker keep both hands free? | No | No | Mostly | Yes | Yes | Yes | Yes | Mostly |
| Easy to move when the layout changes | Very high | High | High | Medium | Low | Very high | Medium | High |
| Can reduce worker travel by itself | No | No | No | No | No | No | No | Sometimes |
| Easy for a new worker to learn | Medium | Medium | Medium | Medium | Very high | Very high | Medium | Medium |
| Typical upfront cost | Very low | Low | Low–medium | Medium | Medium–high | Low–medium | High | High |
| Computer-system setup effort | Very low | Low–medium | Low–medium | Medium | Medium | Low–medium | High | High |
| Strongest feature | Simple | Confirms identity | Easier scanning | Hands and eyes free | Fast fixed work | Flexible visual work | Shows rich instructions | May reduce travel |
| Common problem | No automatic check | Workers skip scans | Poor device fit | Noise or worker acceptance | Hard to rearrange | Poor task design | Blocked camera or setup drift | Robot traffic |
What happens to each order while several orders are being worked?
Compare the walking that may be saved with the tracking and sorting work that the method adds.
Lower volume, unusual orders, or urgent work
Long routes with many small, similar orders
One worker or tote owns the order
Usually goes straight to packing
Many small orders that share popular products
Large or irregular items, or weak sorting control
Track the total picked for the batch
Items must be sorted into orders
Often a small number of orders per trip, limited by cart space, aisle width, product size, and order size
Oversized orders or aisles that do not fit the cart
Each cart position belongs to one order
Usually goes straight to packing
Large buildings, many products, or areas needing special skills
Low volume or zones with very uneven work
Track which zone still owes work
Parts of the order must be combined
Stable zones in a fixed sequence
Workload changes sharply from zone to zone
Track the tote and each handoff
Order finishes after the last zone
High volume, suitable product sizes, and a strong equipment case
Very irregular products or limited maintenance support
Track stock movement and station work
Depends on the equipment design
A good recommendation may be paper, better shelf locations, voice, mobile robots, or no equipment project.
The first goal is to solve the warehouse problem. Voodoo should only be considered when light-directed guidance fits the work.
Volume is too low to justify more than paper or barcode scanning.
Poor product placement is causing the travel problem.
Long-distance movement makes mobile robots or goods-to-person equipment more relevant.
Voice may be a better fit for hands-free case picking in a freezer.
The work is mainly full-pallet movement by forklift.
Packing, replenishment, or the dock—not picking—is limiting output.