Pareto chart 4060171 216996876 2008-06-04T04:06:35Z 24.130.14.170 This assertion needs a reference. [[Image:Pareto.png|thumb|Simple example of a '''Pareto chart''' using hypothetical data showing the relative frequency of reasons for arriving late at work.|right|400px]] A '''Pareto chart''' is a special type of bar chart where ''the values being plotted are arranged in descending order.'' The graph is accompanied by a line graph which shows the cumulative totals of each category, left to right. The chart is named after [[Vilfredo Pareto]], and its use in [[quality assurance]] was popularized by [[Joseph M. Juran]] and [[Kaoru Ishikawa]]. The Pareto chart is one of the seven basic tools of quality control, which include the [[histogram]], Pareto chart, [[check sheet]], [[control chart]], [[Ishikawa diagram|cause-and-effect diagram]], [[flowchart]], and [[scatter diagram]]. See [[glossary of quality management]]. These charts can be generated in MS office or Open office tools without difficulties. It is possible to use one of the software tools or one of free "online quality chart generators" as well. Typically on the left vertical axis is frequency of occurrence, but it can alternatively represent cost or other 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. The purpose is to highlight the most important among a (typically large) set of factors. In [[quality control]], the Pareto chart often represents the most common sources of defects, the highest occurring type of defect, or the most frequent reasons for customer complaints, etc. The Pareto chart was developed to illustrate the [[80-20 Rule]]{{fact|date= June 2008}} — that 80 percent of the problems stem from 20 percent of the causes. ==External links== * [http://www.isixsigma.com/library/content/c010527a.asp Brief discussion, with example] [[Category:Quality control tools]] {{economy-stub}} [[de:Paretodiagramm]] [[es:Diagrama de Pareto]] [[fr:Diagramme de Pareto]] [[ko:파레토도]] [[he:תרשים פארטו]] [[lt:Pareto kreivė]] [[ja:パレート図]] [[no:Paretodiagram]] [[pl:Diagram Pareto]] [[pt:Diagrama de Pareto]] [[ru:Кривая Парето]]