pareto analysis tool
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Trivial many
Vital few
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FICCI CE
Pareto analysis
The Pareto principle is to concentrate on “vital few” rather than “trivial many” in tackling quality problems.
The Pareto diagram is a tool for identifying few actually important causes for defectives which result in large proportion of defectives, instead of concentrating on large number of causes which contributes to a small proportion of the total defectives.
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FICCI CE
80 : 20
A term referring to the Pareto principle, which was first defined by J.M. Juran in 1950. The principle suggests most effect come from relatively few causes; that is 80% of the effects come from 20% of the possible causes.
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FICCI CE
Constructing a Pareto chart
A Pareto diagram is a bar chart of number of defectives with bars representing the number of defectives due to different sources arranged in descending order of their importance. A line graph of cumulative number of defectives (Ogive) is also drawn in the same chart. The causes are given along the x axis, the number of defectives are given on the left y axis and the cumulative %defectives is given along the right y axis.
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FICCI CE
Constructing a Pareto chart
Data on defective cords
S No. Source of defectives No. of Percentage defectives defectives
1 Wrong Ply TPM 75 252 Plyless Feeding 150 503 Single end 30 104 Wrong Cable TPM 45 15
Total 300 100
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FICCI CE
Arranging data in descending order
Data on defective cords
S No. Source of defectives No. of Percentage Cumulative defectives defectives % defectives
1 Plyless Feeding 150 50 502 Wrong Ply TPM 75 25 753 Wrong Cable TPM 45 15 904 Single end 30 10 100
Total 300 100
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FICCI CE
Pareto analysis of defective cords
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0%Plylessfeeding
Wrong plyTPM
Wrongcable TPM
Singleend
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FICCI CE