5 Why's Analysis Sheet - Kansas State University
Root Cause Investigation Tool Problem > Solution - 5 Why's Analysis
Benefits of the 5 Whys:
It helps to quickly identify the root cause of a problem. It helps to differentiate between the contributing factors of a problem and its root cause(s). It helps determine the relationship between different root causes of a problem. It can be learned quickly and doesn't require statistical analysis to be used. When are the 5 Whys most useful?
When problems involve human factors or interactions. In all types of health, safety and environmental situations whether investigating a personal injury or solving the reasons behind an environmental incident. Example of a 5 Why Analysis:
A worker looses the tip of his finger when it's pinched between a drive belt and an unguarded pulley. The first step is to identify the problem. In our case it's self-evident. Continue to ask WHY about each response to a question and when you are no longer able to answer the question you've likely arrived at a root cause.
1. Why was the worker's finger crushed?
His finger was caught between a moving pulley and belt.
2. Why was the finger caught between the pulley and the belt?
The guard on the pulley was missing.
3. Why was the guard missing?
A mechanic had overlooked replacing it.
4. Why was it overlooked?
There is no written equipment servicing checklist.
5. Why is there no checklist?
No hazard assessment was completed.
06.01.16
Problem > Solution - 5 Why's Analysis Worksheet
Department: Problem Description:
Location:
Date:
Use this route to specify the nonconformity that is being investigated.
Therefore
Why?
Therefore
Why?
Therefore
Use this route to investigate why the problem wasn't detected.
Therefore
Why?
Why?
Therefore Why?
Why?
Therefore
Why?
Therefore
Use this route to investigate the root cause of the system.
Therefore
Why?
Why?
Therefore Why?
Why?
Therefore
Why?
Therefore
Why?
Therefore
Why?
Why?
Product/Process:
Root Causes
Corrective & Preventive Actions Responsible Party
A
A
Therefore
Why?
B
B
Therefore
Why?
C
C
Therefore
Date
Why?
Problem > Solution Completed: Solution Date:
Break point of the change in the process:
Implementation Date:
................
................
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