pare to principle
TRANSCRIPT
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Pareto Principle
The Vital Few and Trivial Many Rule
Predictable Imbalance
80:20 Rule
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Named after Vilfredo Pareto -an Italian economist
He observed in 1906 that 20%of the Italian population owned80% of Italy's wealth
He then noticed that 20% of thepea pods in his gardenaccounted for 80% of his peacrop each year
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The Pareto Principle
A small number of causes is responsible for alarge percentage of the effect-
-usually a 20-percent to 80-percent ratio.
This basic principle translates well into qualityproblems - most quality problems result from asmall number of causes.
You can apply this ratio to almost anything,from the science of management to the physicalworld
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Addressing the most troublesome 20% of the
problem will solve 80% of it.
Within your process, 20% of the individuals will
cause 80% of your headaches.
Of all the solutions you identify, about 20% are
likely to remain viable after adequate analysis.
80% of the work is usually done by 20% of thepeople.
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80% of the quality can be gotten in 20% of thetime -- perfection takes 5 times longer
20% of the defects cause 80% of the problems.
Project Managers know that 20% of the work
(the first 10% and the last 10%) consume 80%
of the time and resources.
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A Pareto chart is a useful tool for graphically
depicting these and other relationships
It is a simple Histogram style graph that ranks
problems in order of magnitude to determine the
priorities for improvement activities
The goal is to target the largest potential
improvement area then move on to the next, then
next, and in so doing address the area of most
benefit first
The chart can help show you where allocating
time, human, and financial resources will yield
the best results.
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While the rule is not an absolute, one
should use it as a guide and referencepoint to ask whether or not you are truly
focusing on:
20% - The Vital Fewor
80% - The Trivial Many
True progress results from a consistent
focus on the 20% most critical
objectives.
the
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The simplicity of the Pareto concept
makes it prone to be underestimatedand overlooked as a key tool for
quality improvement.
Generally, individuals tend to think they
know the important problem areas
requiring attention
if they really know, why do problem
areas still exist?
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Although the idea is quite
simple, to gain a working
knowledge of the ParetoPrinciple and its application, it
is necessary to understand the
following basic elements:
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Pareto Analysis
Creating an tabular array of representativesample data that ranks the parts to the
whole
with the objective to use the facts to find thehighest concentration of quality
improvement potential in the fewest
number of projects or remedies
Thus achieving the highest return for the
investment.
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Defect Press
22x28
Press
38 2-C
Press
77 5-C
Press
77 4-C
Total
Defects
Color
Variation
550 430 234 476 1690
Misregister 150 27 31 265 473
Hickeys 50 45 80 10 185
Scuffing 10 14 3 60 87
Excess Spray 16 21 30 5 72
Other 30 37 21 30 118
totals 806 574 399 846 2625
% Waste 30.70 21.87 15.20 32.23 100
Pareto Analysis ofPrinting Defects
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Pareto Diagram
The Category Contribution, the causes of
whatever is being investigated, are listed
across the bottom, and a percentage is
assigned for each (Relative Frequency) to
total 100%. A vertical bar chart is
constructed, from left to right, in order of
magnitude, using the percentages for eachcategory.
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Pareto Diagram is a combined barchartand line diagram based on
cumulative percentages.
80% improvement in quality or
performance can reasonably be expectedby eliminating 20% of the causes of
unacceptable quality or performance
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Pareto Diagram of TotalPrinting Defects
0
500
1000
1500
2000
2500
olor
ri
tion
Mi
regi
ter
Hi
eys
Ot
er
Scuffing
E
xcessSpray
Defect
Totaldefects
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
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0
100
200
300
400
500
600
700
800
Color
aria
ion
isregis
er
Hickeys
her
xcess
pray
cu
ing
Defect
ess22x28
0
10
20
30
40
50
60
70
80
90
100
0
100
200
300
400
500
Color
aria
ion
Hickeys
her
isregis
er
Defect
ess38' 2 C
050
100
150
200
250
300
350
Color
aria
ion
Hickeys
isregis
er
!
xcess"
pray
#
her
"
cu$ $
ing
Defect
%
&
ess 77" 5-C
0'
10
'
20
'
30
'
40
'
50
'
60
'
70
'
80
'
90
'
100
'
0
100
200
300
400
500
600
700
800
Color
aria
ion
isregis
er
cu
ing
her
Defect
ess77" 4-C
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Relative Frequency
[(Category Contribution) / (Total of all
Categories)] x 100 expressed in bar chart
form.
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Cumulative Frequency
[(Relative Frequency ofCategory
Contribution) + (Previous Cumulative
Frequency)] expressed as a line graph
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Break Point
The percentage point on the line graph for
Cumulative Frequency at which there is a
significant decrease in the slope of the
plotted line
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Vital Few
Category Contributions that appear to the
left of the Break Point account for the bulk
of the effect
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Trivial Many
Category Contributions that appear to the
right of the Break Point, which account for
the least of the effect.
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Pareto Diagram Analysis
Pareto analysis provides the mechanism
to control and direct effort by fact, not by
emotion.
It helps to clearly establish top priorities
and to identify both profitable and
unprofitable targets.
In addition to selecting and defining
key quality improvement programs:
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Prioritize problems, goals, and objectives
Identify root causes
Select key customer relations and service programs Select key employee relations improvement
programs
Select and define key performance improvement
programs Address the Vital Few and the Trivial Many causes
of nonconformance
Maximize research and product development time
Verify operating procedures and manufacturingprocesses
Product or services sales and distribution
Allocate physical, financial and human resources
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The value of the Pareto Principle isthat it focuses efforts on the 20 percentthat matters.
Of the things you do during your day,only 20 percent really matter. Those 20percent produce 80 percent of yourresults.
Identify and focus on those things.
For a General Manager
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To Create a Pareto Chart:
Select the items (problems,issues
,actions
,defects, etc.) to be compared.
Select a standard for measurement.
Gather necessary data
Arrange the items on the horizontal axis in a
descending order according to themeasurements you selected.
Draw a bar graph where the height is the
measurement you selected.