Which chart uses rule of 20:80? - Metrology & Quality Control

Q.  Which type of chart uses the rule of 20:80?
- Published on 07 Aug 15

a. cause and effect chart
b. Pareto chart
c. fish bone diagram
d. control chart

ANSWER: Pareto chart


  • Sravanthi   -Posted on 27 Oct 15
    - Seven quality tools are suggested by Kaoru Ishikawa. These tools are used to solve industrial problems.

    They are as follows:

    1) Check days
    2) Flowcharts
    3) Histograms
    4) Pareto chart
    5) Cause and effect diagram
    6) Scatter diagram
    7) Control charts

    - Pareto chart:

    1) Pareto charts propaged by Vilfredo Pareto are based on 20-80 rule.

    2) According to this rule, 80% of troubles are caused due to 20% problems.

    3) Pareto analysis is a technique which determines beginning of rectification process.

    4) This chart contains both bars and line graphs, and bars denote individual values in descending order and lines represent cumulative total of cost, occurrences, etc

    5) These charts are useful to represent sources of defects, frequent reasons of customer complaints, etc

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