Pareto diagram

Software Quality Management
Anna University Syllabus
B.E. IV CSE
About Pareto Diagram

1. Pareto chart 1
Pareto chart
Pareto chart
One of the Seven Basic Tools of Quality
First described by Joseph M. Juran
Purpose To assess the most frequently-occurring defects by category†
A Pareto chart, named after Vilfredo Pareto, is a type of chart that contains both bars and a line graph, where
individual values are represented in descending order by bars, and the cumulative total is represented by the line.
Simple example of a Pareto chart using hypothetical data showing the relative frequency
of reasons for arriving late at work
The left vertical axis is the frequency
of occurrence, but it can alternatively
represent cost or another important unit
of measure. The right vertical axis is
the cumulative percentage of the total
number of occurrences, total cost, or
total of the particular unit of measure.
Because the reasons are in decreasing
order, the cumulative function is a
concave function. To take the example
above, in order to lower the amount of
late arriving by 80%, it is sufficient to
solve the first three issues.
The purpose of the Pareto chart is to
highlight the most important among a
(typically large) set of factors. In
quality control, it often represents the
most common sources of defects, the
highest occurring type of defect, or the most frequent reasons for customer complaints, and so on.
These charts can be generated by simple spreadsheet programs, such as OpenOffice.org Calc and Microsoft Excel
and specialized statistical software tools as well as online quality charts generators.
The Pareto chart is one of the seven basic tools of quality control.[1]

2. Pareto chart 2
References
[1]Nancy R. Tague (2004). "Seven Basic Quality Tools" (http:/ / www. asq. org/ learn-about-quality/ seven-basic-quality-tools/ overview/
overview. html). The Quality Toolbox. Milwaukee, Wisconsin: American Society for Quality. p. 15. . Retrieved 2010-02-05.
Further reading
•Hart, K. M., & Hart, R. F. (1989). Quantitative methods for quality improvement. Milwaukee, WI: ASQC Quality
Press.
•Juran, J. M. (1962). Quality control handbook. New York: McGraw-Hill.
•Juran, J. M., & Gryna, F. M. (1970). Quality planning and analysis. New York: McGraw-Hill.
•Montgomery, D. C. (1985). Statistical quality control. New York: Wiley.
•Montgomery, D. C. (1991). Design and analysis of experiments, 3rd ed. New York: Wiley.
•Pyzdek, T. (1989). What every engineer should know about quality control. New York: Marcel Dekker.
•Vaughn, R. C. (1974). Quality control. Ames, IA: Iowa State Press.

3. Article Sources and Contributors 3
Article Sources and Contributors
Pareto chart  Source: http://en.wikipedia.org/w/index.php?oldid=411681632  Contributors: A. B., AbsolutDan, Anonymous Dissident, AugPi, BlckKnght, Boxplot, Celique, Ck lostsword,
Cootha, Craigwb, DanielPenfield, [email protected], DylanW, Elbac14, Feureau, Gribeco, Hu12, Imroy, Irishguy, Kormie, LilHelpa, MBlakley, MdG, Melcombe, Metacomet, Michael
Hardy, NajaB, NawlinWiki, Nbarth, Nlskrg, Noe, Nubiatech, ParetoDaddy, PhilKnight, Pm master, Pscott22, Ronz, Rupertb, Seav, Srleffler, Stevegallery, Stillnotelf, SueHay, T-turtle, Taffykins,
Takahashi J, Top Jim, Tuyvan, Verne Equinox, Waycool27, WoodenBooks, 85 anonymous edits
Image Sources, Licenses and Contributors
Image:Pareto chart of titanium investment casting defects.svg  Source: http://en.wikipedia.org/w/index.php?title=File:Pareto_chart_of_titanium_investment_casting_defects.svg  License:
GNU Free Documentation License  Contributors: User:DanielPenfield
File:Pareto.PNG  Source: http://en.wikipedia.org/w/index.php?title=File:Pareto.PNG  License: Public Domain  Contributors: Original uploader was Metacomet at en.wikipedia
License
Creative Commons Attribution-Share Alike 3.0 Unported
http:/ / creativecommons. org/ licenses/ by-sa/ 3. 0/