PARETO DIAGRAM
EXERCISE 1:
The General Manager of Quality Department, Proton Berhad wants to improve the quality of painting work of Proton cars. He decided to analyze the paint work processes to find out how he can reduce the amount of work that the Painting Department had to redo due to defects. Below are the type and frequency of defects of the painting work:
Type of Defect Freq.
Cracks 25
Chips 76
Scratches 90
Uneven Surface 9
Rough Surface 6
Other 8
Draw the Pareto Diagram of the defects before and after improvement of 30% of the major defect.
Guidelines:
1. Write the data in order, from largest to the smallest.
2. Calculate the total.
3. Calculate the cumulative values.
4. Calculate the percent of the total for each item.
5. Calculate the cumulative percentages.
6. Draw the bar chart.
7. Add the percent scale on the right side.
8. Plot the cumulative percentage points.
9. Draw the percent line.
10. Write labels and other information.
Sample table to build Pareto Diagram:
Item Frequency Cumulative Frequency Percent of total Cumulative Percentage
Total
EXERCISE2
Construct a Pareto diagram from the data given in the table below
Category Frequency Percent of total Cumulative %
Wrong dose 100
Wrong time 70
Wrong medicine 15
Wrong patient 8
Medicine dc’d 4
Missed dose 3
Grand Total
EXERCISE2
Painting new auto bodies is a multistep process. There is an “electrocoat” that resists
Corrosion, a primer, a color coat, and a gloss coat. A quality study for one paint shop
Produced this breakdown of the primary problem types for those autos whose paint did
Not meet the manufacturer’s standards:
Category Frequency Percent of total Cumulative %
Electro coat uneven—redone 4
Poor adherence of color to primer 5
Lack of clarity in color 2
“Orange peel” texture in color coat 32
“Orange peel” texture in gloss coat 1
Ripples in color coat 28
Ripples in gloss coat 4
Uneven color thickness 19
Uneven gloss thickness 5
Grand Total
Select Graph Bar Chart to make a Pareto chart. Which stage of the painting process?
Should we look at first?
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