Stand-by "Off"

This is a portable Event Data Collector. It is used to register heart rate of people "on-the-job". Just as the previous example, it's technically a perfect device. However, in terms of human factors, it's not. An error was made that easily confuses the user of the device. To save the batteries, you can set the device to stand-by mode. Normally one would expect a switch that toggles between "On" and "Stand-by". Here, however, the switch (in the yellow circle) toggles between Stand-by "On" and "Off". You really have to think about it; "Off" means the device registers data, so it equals "On". "Stand-by On" means "Stand-by". Logical, but not ergonomically correct.

submitted by Rob van Ouwerkerk

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