文档介绍：Quality Improvement
Mistake Proof (Poka-Yoke)
Module 38
Mistake Proof Operation
Even for processes under control, the possibility of
making mistakes exists.
The goal is therefore to devise techniques that
preclude this possibility
Called
• poka-yoke (foolproof mechanism) or
• buka-yoke (mistake proof mechanism)
1
Foolproofing
“The Japanese word for it is “poka-yoke”. It means
“foolproof mechanism.” Poka-yoke is used to help the
operators work easily by preventing any errors from
affecting their output to the next process or function. This
prevents defects at the source. Originally applied to
machines, poka-yoke can be applied to any process. Only a
foolproofed process pletely eliminate operator
mistakes that cause defects. Keep foolproofing, or poka-
yoke, in mind as you analyze and improve your
processes.”
Kiyoshi Suzaki
Mistake-Proof Operation
• Proactive process design for quality
Causes of mistakes:
üphysical
ühuman
• omissions
• commissions (incorrect action)
• extraneous acts (inappropriate action)
• sequence errors
• timing errors
ücombination of physical and human factors
2
System design to minimize
human errors
• System state feedback clear to operators
• Different types of actions have different sequences
(command sequence)
• Actions are reversible
• Consistency in system
Strategies Fo