A
slip-prone design provides redundant opportunities for slips. This part of the first defense focuses on preventing operator's actions that might divert the operational situation from normal to exceptional. It is applicable to certain types of operational errors, such as activating the wrong function.
The guidelines for preventing operator's errors are borrowed from the discipline of cognitive engineering.
Methods for preventing operator's faults include:
A
slip-prone design provides redundant opportunities for slips.
In a resilience-oriented design we avoid redundant features and controls that are slip-prone.
Slips can also be prevented by slowing down the actions, enabling more control of the human operator, as demonstrated in the Car Gear illustration ...
See Car Gear illustration ...
Many software products are delivered with multitudes of useless
shortcut keys.
For example, Gmail shortcuts ... These shortcut provide more opportunities for activating the wrong feature.
Provide
shortcut keys only to activate selected features: those used most frequently.
Slip-prone sliding selector might be the reason to many
incidences. For example, the
Torrey Canyon accident ... involved unintentional change of the steering lever to a peculiar position.
Slips can also be prevented by slowing down the actions, enabling more control of the human
operator. The
protection
concept is to break the motion to small segments, and to enforce delay between segment.
See Car Gear illustration ...
See Shortcut keys illustration ...
An example of a slip-proof car automatic gear lever is described here ...
See Shortcut keys illustration ...
Updated on 15 Apr 2017.