Where it usually starts
A factory of forty people runs on a planning spreadsheet, a whiteboard by each line and a clipboard per shift.
- The planner builds next week's schedule from the order book on Friday and prints it; by Tuesday a machine has gone down, two orders have been pulled forward by a customer and the printed plan is fiction, but the operators are still working from it.
- Material requirements are worked out by the planner's memory of the bill of materials, so a batch starts before anyone notices the supplier delivery is short, and the line stops.