Back , when Metro de Madrid had chief station managers in each platform, in the manager booth there was a button on the phone labeled "all call". It allowed you to page every station manager in the entire line at once.

It was a lot easier to hit all call than to just track down someone. After a while, this group interruption gets tiresome because it's so wasteful. You interrupt 10 people to reach one, or you get four offers of help when one was all you needed... Continuar leyendo