Using the Pareto Chart the team was able to find the various symptoms that accounted for Potholes in the city.

2. Introduction to Pareto Diagram
Pareto chart is used to graphically summarize and display
the relative importance of the differences between groups
of data
It is one of the seven basic tools of quality control
The independent variables on the chart are shown on the
horizontal axis and the dependent variables are portrayed
as the heights of bars
The values of the statistical variables are placed in order of
relative frequency, the graph clearly reveals which factors
have the greatest impact and where attention is likely to
yield the greatest benefit
Ref- http://www.isixsigma.com/tools-templates/pareto/pareto-chart-bar-chart-
histogram-and-pareto-principle-8020-rule/
http://whatis.techtarget.com/definition/Pareto-chart-Pareto-distribution-diagram

3. Stratification of symptoms of the
selected problems
 Improper planning
 Use of bad quality raw materials
 Improper mixing of raw material cause low quality final
product
 Unskilled workforce
 Improper drainage during monsoon
 Negligence of maintenance of the roads

4. Stratification of symptoms
• Administrative /political
1. Improper distribution of road contracts/tenders
2. Corruption / Malpractices in the construction of roads
• Functional
1. Lack and improper maintenance
2. Use of old techniques (use of tar and gravel) for making
roads
3. Use of unskilled workforce
4. Improper or leaked drainage system that weakens the soil
beneath the road
• Climatic conditions
1. High temperature - Causes tar to melt and become loose
and pull away from the road
2. Rainy season - Use of Improper gravel size causes the
water to get into the pavement or be stationary on it

6. The team did a survey to find out the major symptoms that
accounted for 80% frequency
 Number of roads analysed – 30
Gathered information from localities about :
Number of potholes in the road in different season
How many times the road was reconstructed
Use of any unfair means in the construction
Maintenance of the road
Material used in the construction/maintenance of the road
 Is the technique used for construction the main symptom
Identification of symptoms

7. Cont ..
Below given are the team findings:
(Assumption: For each road we have considered only the
major factor)

8. Pareto Chart
Symptoms Accounting for 80% of the frequency

9. Problem Definitions of symptoms
The three main symptoms identified are
Improper Distribution of Road Contract
Corruption / Malpractices in the construction of roads
Lack or improper maintenance

10. Problem Description
 Improper Distribution of Road Contracts:
i. Work taking place on irregular phases
ii. No surveillance on the contractors
iii. Roads constructed before monsoon in a short period and in
haphazard manner

11. Cont..
Corruption / Malpractices in the construction of roads:
i. Use of low quality material
ii. Use of unskilled labours
iii. Sometimes just a thin layer of tar and gravel is spread on
the old pavement
Lack or improper maintenance:
i. Zero or low maintenance of the roads
ii. Temporary repair done which is not long lasting
iii. Roads dig for drainage or other purpose are not
reconstruction properly

12. Team Learning
 Using the Pareto Chart the team was able to find the
various symptoms that accounted for Potholes in the city
 With the help of this quality control tool we were able to
distinguish the major symptoms
 The major symptom that has accounted for the potholes
in the city is the improper distribution of contracts or
tenders, lack of maintenance and malpractices during
construction of road
Government should perform regular surveillance to check
the progress of the road construction and quality of
material used
 Proper maintenance of the roads can minimize the
potholes

13. THANK YOUTHANK YOU