Is there an underlying problem of crying wolf; too many warning messages obscure the ones that are really matters of life and death?
This is certainly an enormous problem for interface design in general for many systems where there is some element of danger. The classic “needle tipping into the red” is an old and brilliant solution for some kinds of gauges—an analogue meter where you can see the reading tipping toward a brightly marked “danger zone”, usually with a ‘safe’ zone and an intermediate zone also marked, has surely prevented many accidents. If the pressure gauge on the door had such a meter where green meant “safe to open hatches” and red meant “terribly dangerous”, that might have been a better design than just raw numbers.
I haven’t worked with pressure doors but I have worked with large vacuum systems, cryogenic systems, labs with lasers that could blind you or x-ray machines that can be dangerously intense, and so on. I can attest that the designers of physics lab equipment do indeed put a good deal of thought and effort into various displays that indicate when the equipment is in a dangerous state.
However, when there are /many/ things that can go dangerously wrong, it becomes very difficult to avoid cluttering the sensorium of the operator with various warnings. The classic example are the control panels for vehicles like airplanes or space ships; you can see a beautiful illustration of the ‘indicator clutter problem’ in the movie “Airplane!”:
This is certainly an enormous problem for interface design in general for many systems where there is some element of danger. The classic “needle tipping into the red” is an old and brilliant solution for some kinds of gauges—an analogue meter where you can see the reading tipping toward a brightly marked “danger zone”, usually with a ‘safe’ zone and an intermediate zone also marked, has surely prevented many accidents. If the pressure gauge on the door had such a meter where green meant “safe to open hatches” and red meant “terribly dangerous”, that might have been a better design than just raw numbers.
I haven’t worked with pressure doors but I have worked with large vacuum systems, cryogenic systems, labs with lasers that could blind you or x-ray machines that can be dangerously intense, and so on. I can attest that the designers of physics lab equipment do indeed put a good deal of thought and effort into various displays that indicate when the equipment is in a dangerous state.
However, when there are /many/ things that can go dangerously wrong, it becomes very difficult to avoid cluttering the sensorium of the operator with various warnings. The classic example are the control panels for vehicles like airplanes or space ships; you can see a beautiful illustration of the ‘indicator clutter problem’ in the movie “Airplane!”: