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Defect concentration diagram

From Wikipedia, the free encyclopedia
Concentration diagram of Cholera deaths 1854 in London (John Snow (1813-1858))

The defect concentration diagram (also problem concentration diagram[1]) is a graphical tool that is useful in analyzing the causes of the product or part defects.[2] It is a drawing of the product (or other item of interest), with all relevant views displayed, onto which the locations and frequencies of various defects are shown.

Usage

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Defect concentration diagram is used effectively in the following situations:

  1. During data collection phase of problem identification.
  2. Analyzing a part or assembly for possible defects.
  3. Analyzing a product (or a part of a product) being manufactured with several defects.

Steps

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There are a number of steps that are needed to be follow when constructing the defect concentration diagram:

  1. Define the fault or faults (or whatever) being investigated.
  2. Make a map, drawing, or picture.
  3. Mark on the diagram each time a fault (or whatever) occurs and where it occurs.
  4. After a sufficient period of time, analyze it to identify where the faults occur.

References

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  1. ^ Bjørn Andersen, Tom Fagerhaug, and Marti Beltz, Problem Concentration Diagram, on https://ASQ.org; read 20. August 2015.
  2. ^ Douglas Montgomery (2005). Introduction to Statistical Quality Control. John Wiley & Sons, Inc. ISBN 978-0-471-65631-9