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Extra coding in case one idea isn’t enough
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Extra coding in case one idea isn’t enough
Redundancy refers to things that are not needed or no longer needed. In communications, redundancy refers to extra features that may not be needed, but are added just in case.
The sound quality of radios in planes can be crackly so when saying the number nine, pilots and controllers say ‘niner’– so it can’t be misheard as five. The ‘er’ is redundant information, added just in case.
Traffic lights use colour coding, but there are colour blind people. So they use position as well as colour.
A few years ago, the Guardian newspaper started using a graphic to show football teams’ recent form. A green line meant a win, a red line meant a loss, and a grey line was a draw. The problem was that colour blind people couldn’t tell the difference (8% of men, so possibly close to 8% of people who read the football page). So they added redundancy: ascenders for the wins and descenders for the losses. Much better.
A push plate on a door is a signal that you push to open the door. The word ‘push’, possible redundant, makes sure.