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Fishbone Diagram

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Wolfgang Kostenzer

on 1 September 2013

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Transcript of Fishbone Diagram

The Fishbone Method
Kaoru Ishikawa
Ishikawa Diagram
Method & Application
Pros & Cons
1915 - 1989 in Japan

1943 first introduction of the Fishbone diagram

quality manager for Nissan (1941-1947)

1962 first introduction of the Quality Circles
Kaoru Ishikawa
Hard to break down complex problems
No cross-linked cause-effect relationships represented
Interactions and temporal dependencies are not covered
Few thick clusters & specific causes may need further studies
Decide on the effect to examine
Operational Definitions
Phrase effect as
positive (an objective)
negative (a problem)
Step 1: Identify the Problem
Step 2: Categories Involved
3M’s and P:
Methods, Materials, Machinery, and People

Policies, Procedures, People and Plant

Machine, Method, Materials, Measurement, Man and Mother nature
Step 3: Identify Possible Causes
The Fishbone Method
Ishikawa Diagram
Step 1:
Identify the problem

Step 2:
Major factors involved

Step 3:
Identify possible causes

Step 4:
Add detailed levels

Step 5:
Analyze your diagram
Find possible causes to your problem related to the factors

Causes are shown on shorter lines coming off the 'bones'

If cause is complex break it down into subcauses
Diagram now shows all the possible causes

Consider the following:
Many branches under one category may need further study
Few branches under one category may need more analysis
If several major categories have only a few branches, they may need to be combined
Step 5: Analyze Your Diagram
Step 4: Add Detailed Levels
Identify increasingly more detailed levels of causes

Organize them under related causes or categories

Ask series of 'why questions'

organize creation of diagram like a brainwriting session everybody gets a voice
Concept Fan:
try to see the broader picture, participants might be limited by framework (e.g. 6M‘s)
encourage really creative thinking because participants are likely to think in their normal patterns

Lessons from
other Techniques
Too many
rejected bottles
Good basis for discussion
Easy to learn and apply
Promoting a better understanding of problems
Focus on the 'bigger' picture
Thoughtful analysis without overlooking root causes
Increases process knowledge
Concept Fan
Full transcript