For manufacturers using consignment inventory or kanban systems, manual reordering creates bottlenecks that stop production. A worker notices bin 47 is running low on M8 socket head screws. They write the bin number on paper, take it to purchasing at end of shift, and purchasing calls the supplier the next day. By then, the bin might be empty and production is waiting.
Phone orders are error-prone and time-consuming. The purchasing person reads part numbers over the phone, mishears specifications, and spends 10 minutes per order. Wrong parts get ordered - M6 instead of M8, button head instead of socket head. The wrong parts arrive, can't be used, and production delays continue while correct parts are rush-ordered.
This manual process wastes time at every step. Workers spend time writing notes, walking to the purchasing department, and explaining what's needed. Purchasing staff spend hours on phone calls when they could focus on strategic sourcing and supplier negotiations. The supplier's order entry person spends time deciphering handwritten notes and clarifying unclear requests.
Just-in-time inventory becomes impossible when reordering takes 3-5 days. You need larger safety stock to compensate for slow reorder cycles, tying up capital in excess inventory. Your supplier wants to offer vendor-managed inventory but can't without a streamlined communication system. You need instant, error-free reordering that anyone on the production floor can trigger.