The Role of Fishbone Diagram in Analyzing Cause and Effect

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Fishbone Diagram
The Role of Fishbone Diagram in Analyzing Cause and Effect

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Definition
A fishbone diagram provides a structured way to identify and organize the
potential causes of a p...

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Definition
It is called this way because of its visual representation that looks like the
skeleton of a fish...

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Uses
Often used during brainstorming sessions to identify the causes of an
undesirable effect or a problem.
...

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Uses
Often used in Lean Six Sigma and other quality improvement approaches
to narrow down the area of analys...

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Uses
Used to identify the sources of variation within a process which causes a
problem to occur.
Fishbone Di...

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Benefits
Provides clarity regarding the causes of an effect in any problematic scenario.
Fishbone Diagram 7
...

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Benefits
Fishbone Diagram 8
Identifies the potential factors that
may cause an effect to prevent future
prob...

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Structure
The first step in conducting a fishbone analysis is to clearly define the
effect.
Fishbone Diagram...

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Structure
The effect will become the head of the fishbone.
Fishbone Diagram 10
Effect
• Should be brief.
• U...

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Structure
The causes will be placed in the branches of the chart.
Fishbone Diagram 11
Each cause needs to be...

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Structure
A fishbone diagram allows to identify the hierarchy of causes including the
possible root causes.
...

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Structure
Combining the fishbone with the 5 whys gives the analysis an extra
dimension.
Fishbone Diagram 13
...

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Grouping Potential Causes
Potential causes in a fishbone diagram are normally grouped into
categories for ea...

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Grouping Potential Causes
There are different approaches of constructing a fishbone diagram
indicated by the...

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Grouping Potential Causes – 4 Ms
One of the most basic forms to group the potential causes of a problem or
e...

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Grouping Potential Causes – 6 Ms
The most common way to categorize potential causes of a problem or
effect.
...

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Grouping Potential Causes – 6 Ms
Man – Anyone involved with the process and contributes to the effect
Includ...

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Grouping Potential Causes – 6 Ms
Method – How the process is performed and the specific requirements for
doi...

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Grouping Potential Causes – 6 Ms
Machine – The machinery, equipment and tools required to perform the
proces...

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Grouping Potential Causes – 6 Ms
Material – All the materials needed to perform a process.
Fishbone Diagram ...

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Grouping Potential Causes – 6 Ms
Environment – The conditions in which the process operates.
Fishbone Diagra...

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Grouping Potential Causes – 6 Ms
Measurement – The data and metrics that are used to evaluate the
performanc...

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Grouping Potential Causes – 6 Ms
Different names may be used for the same category depending on the
situatio...

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Grouping Potential Causes – 8 Ms
Adds Management and Maintenance to the 6 M categories.
Fishbone Diagram 25
...

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Grouping Potential Causes
When you are working on an affinity diagram, you can use the titles of the
affinit...

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Grouping Potential Causes
When the effect results from a documented or mapped process, the
process steps can...

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Grouping Potential Causes
You may also create subcategories of a main category and include it in new
branche...

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Grouping Potential Causes
You may even rename or create your own branches that best suit your
project.
Fishb...

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Grouping Potential Causes
Typical Categories for Manufacturing and Non-Manufacturing Processes.
Fishbone Dia...

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Steps for Drawing a Fishbone Diagram
Fishbone Diagram 31
With your team, clearly define the effect that you ...

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Steps for Drawing a Fishbone Diagram
Fishbone Diagram 32
Identify the cause categories using the 4Ms or any ...

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Steps for Drawing a Fishbone Diagram
Fishbone Diagram 33
Use brainstorming to log all possible causes under ...

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Steps for Drawing a Fishbone Diagram
Fishbone Diagram 34
Take time to ensure the appropriateness of the reco...

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Steps for Drawing a Fishbone Diagram
Fishbone Diagram 35
Highlight or assign numbers near to the key causes ...

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Steps for Drawing a Fishbone Diagram
Fishbone Diagram 36
If necessary, collect data to confirm key causes ar...

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Example – Increased Invoice Errors
Fishbone Diagram 37
Increased
Invoice Errors
Cumbersome process
Manual da...

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Example – Increased Coolant Consumption
Fishbone Diagram 38
High Coolant
Consumption
Man
Measure
Material
En...

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Example – Coffee Flavor
Fishbone Diagram 39
Over roasting
Not fresh coffee beans
Unclean coffee maker
Low wa...

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Further Information
Be aware of adding causes which are actually solutions.
Fishbone Diagram 40
The main ide...

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Further Information
A cause-and-effect matrix can be used to prioritize the causes of the
problem.
Fishbone ...

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Further Information
Another way of highlighting the structure of the possible causes is to use
the tree diag...

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Further Information
The measure of success for a fishbone diagram is typically the quantity of
ideas generat...

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Further Information
A fishbone diagram can also be used to structure the thoughts of a team.
Fishbone Diagra...

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Further Information
Sometimes it is useful to brainstorm out the ideas first then organize them
by category ...

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