Identity the problem that is the priority
Clarify the Problem
What should be happening? What is actually happening?
Break the problem into individual problems if necessary
If necessary user temporary measures to contain the abnormal occurrence until the root cause can be addressed.
Locate the point of cause of the problem – Do not go into cause investigation (next step) until you find the point of cause.
Grasp the tendency of the abnormal occurrence at the point of cause
If necessary, “go and see”
Identify and confirm the direct cause of the abnormal occurrence
5-Why investigation to build a chain of cause/effect relationships to root cause Stop at the cause that must be addressed to prevent recurrence.
Develop and Test Countermeasure
Take one specific action to address the root cause
Try to change only one factor at a time, so you can see correlation
Monitor and confirm results
Standardize successful countermeasure
Reflect. What did we learn during this problem-solving process?