_The user enters how many boxes they want to pack and clicks Print, which prints a unique QR code inventory control label for each box. The packer affixes the Q

_The user enters how many boxes they want to pack and clicks Print, which prints a unique QR code inventory control label for each box. The packer affixes the QR code labels to the packed boxes, places them in the staging area, and moves onto the next box._ I've built a logistics system, where we did this until I realised that it is much more convenient to have a roll of pre-printed labels, that are scanned by the operator and then linked to a record in the application. You don't have to wait around for the printer to complete, you don't even have to input how many boxes you want to pack - You just point and scan. It also allows you to have the labels attached to the boxes in advance (or printed on). You can buy a roll of pre-printed bar codes for cheap, from print shops etc. In general, I found that "reversing the order of control" works very well. Instead of having the system tell the operator what to do (which would be a natural solution from a software perspective), it's often much more flexible and efficient to have the operator tell the system what he did and then deal with that.