Despite all efforts made to build in quality and factory-friendliness at the design stage, problems may well arise, inside or outside the company, from any point from prototyping through volume production. When this happens, it is important to establish the facts, investigate the causes, send prompt feedback to the preceding stage, work out how to stop the same thing from happening again, and take corrective action. Figure “A Typical Troubleshooting System” shows a typical troubleshooting (TS) system that makes use of information about problems arising during the Early Product Management process.