short pareto
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paretoTRANSCRIPT
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Pareto Principle
• Alfredo Pareto (1848-1923) Italian Economist:– Conducted studies of the distribution of wealth in
Europe.– 20% of the population has 80% of the wealth
• Joseph Juran used the term “vital few & trivial many or useful many”. He noted that 20% of the quality problems caused 80% of the dollar loss.
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Pareto diagram
Perc
ent f
rom
eac
h ca
use
Causes of poor quality
Machine c
alibrati
ons
Defecti
ve part
s
Wrong d
imen
sions
Poor D
esign
Operator e
rrors
Defecti
ve m
ateria
ls
Surfa
ce ab
rasions
0
10
20
30
40
50
60
70(64)
(13)(10)
(6)(3) (2) (2)
A pareto diagram is a graph that ranks data classifications in descending order from left to right.
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Pareto diagram%
Com
plai
nts
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Pareto diagram
• Sometimes a pareto diagram has a cumulative line.
• This line represents the sum of the data as they are added together from left to right.
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Pareto diagram
• Sometimes a pareto diagram has a cumulative line.
• This line represents the sum of the data as they are added together from left to right.
Above the bars, using the 2nd Y-axis representing the cumulative data, plot the cumulative percentage values in the form of a line.
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Pareto diagram• The cumulative percentage can be computed (dotted line).
• On the right, add a vertical percent scale equal in length to the scale on the left.
• Label this from 0% to 100% .
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Pareto diagramTable 1. Example of a Tabulation of Causes of Ball Bond Lifting for use in a Pareto Chart
Ball Lifting Cause Frequency Percent (%) Cum Percent (%)
Bonder Set-up Issues 19 38% 38%Unetched Glass on Bond Pad 11 22% 60%Foreign Contam on Bond Pad 9 18% 78%Excessive Probe Damage 3 6% 84%Silicon Dust on Bond Pad 2 4% 88%Corrosion 1 2% 90%Bond Pad Peel-off 1 2% 92%Cratering 1 2% 94%Resin Bleed-out 1 2% 96%Others 2 4% 100%Total 50 100% -
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Pareto diagramTable 1. Example of a Tabulation of Causes of Ball Bond Lifting for use in a Pareto Chart
Ball Lifting Cause Frequency Percent (%) Cum Percent (%)
Bonder Set-up Issues 19 38% 38%Unetched Glass on Bond Pad 11 22% 60%Foreign Contam on Bond Pad 9 18% 78%Excessive Probe Damage 3 6% 84%Silicon Dust on Bond Pad 2 4% 88%Corrosion 1 2% 90%Bond Pad Peel-off 1 2% 92%Cratering 1 2% 94%Resin Bleed-out 1 2% 96%Others 2 4% 100%Total 50 100% -