When I hear the muffled beep that signals someone else coming in on the line, I experience a mild form of panic. I can pretty much work out from the display what button I need to press to put my current caller on hold, but I know from bitter experience that this is no guarantee I'll be able to get them back again later. →
You're in trouble because (a) all our tools are predicated on tests that start green and stay green, and (b) how do you tell that the test still works? It can't exactly go more red than it is now. →