What is 5
Why?
5 Why analysis is one of the Six Sigma tool which is very
useful tool adapted in most of the industries. The ultimate goal of 5 Why
analysis is to dig the real cause of the problem. This methodology was
developed by Japanese industrialist and Inventor, Sakichi Toyoda (Founder of
Toyota Industries). The 5 Why's was first applied to the motor manufacturing of
Toyota Motor Corporation.
Examples of
5 Why's:
Problem: Robotic Arm stopped
working
1. Why robotic arm stopped
working?
Because Circuit
has overloaded, causing a fuse to blow
2. Why is the circuit overloaded?
There was insufficient
lubrication on the bearing, so they locked up
3. Why was there insufficient
lubrication on the bearing?
The oil pump on the robotic
arm is not circulation sufficient oil.
4. Why is the pump not
circulating sufficient oil?
The pump intake clogged with
metal shaving.
5. Why is the intake clogged with
metal shaving?
Because there is no filter on
the pump.
As showed in above example, the root cause behind the failure
of robotic arm was “no filter on the oil pump”. In most cases you will find
your solution to the problem by using 5 Why analysis, but if you are still not
satisfied with the solution you can continue with more “Why’s”.
After finding the root cause with 5 Why analysis you need
to take corrective actions to solve the problem and preventive action to
prevent the problem from occurring again in future.
For exercise use the below templates.
Templates:
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