A visual guarantee is a mechanism that builds information so deeply into the process that it becomes impossible to do the wrong thing. We can do the right things only. Poka-yoke and mistake proofing are two other names for this kind of device.
A visual guarantee, requires us to do the right thing while preventing us from doing the wrong thing. Visual guarantees or poka-yoke devices are the highest level of visual devices because behavior is so deeply imbedded.
from
Work That Makes Sense
by Dr. Gwendolyn Galsworth
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