,,5 WHYS" Method
,,Five whys” is a problem-solving method that explores the underlying cause-and-effect of particular problems.The primary goal is to determine the root cause of a defect or a problem by successively asking the question “Why?”. Each time you ask why, there might be more than one answer,In other words, a problem may have different potential root causes.
The technique was originally developed by Sakichi Toyoda ინ 1930s,who stated that "by repeating why five times, the nature of the problem as well as its solution becomes clear." It became popular in the 1970s, and Toyota still uses it to solve problems today.
The Benefits of Five Whys
- Helps identify the root cause of a problem
- Understand how one process can cause a chain of problems
- Determine the relationship between different root causes
- Highly effective without complicated evaluation techniques
How to Complete a Five Whys Root Cause Analysis
- Begin with a specific problem. What is it that you are having an issue with? This can also help the team focus on the same problem.
- Ask why the problem happened and write the answer down below the specific problem you listed in step one.
- Keep asking “why” to each of the successive answers you write down until you reach the root cause of the problem.
- Again, this may take more or less than five “why”s. Make sure your team sees eye-to-eye with each of the questions being answered as well as the final root cause.
• The problem is usually placed on the left side of the diagram, and the most specific causes are placed on the right side
• Lines can be used to connect causes
• The most specific reasons are reflected as you move to the right
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