Pareto analysis tool
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Trivial many
Vital few
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.
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.
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.
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
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
FICCI CE
Pareto analysis of defective cords
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0%Plylessfeeding
Wrong plyTPM
Wrongcable TPM
Singleend
FICCI CE