The document discusses Andon, a visual signaling system used in factories to indicate issues that need attention. It suggests Andon signals can be lights or sounds and should be placed where operators and support staff can see or hear them. Locations can include operator stations, automated equipment, and areas needing monitoring. The document stresses determining signal needs, establishing protocols, training employees, and monitoring usage to ensure Andon is used effectively and problems are solved rather than just reacted to. It notes Andon implementation can range in cost but the most important factor is developing a culture where problems are stopped and supported.