Defect concentration diagram

18 Jan

The defect concentration diagram is a graphical tool that is useful in analyzing the causes of the product or part defect. 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.

defect concentration


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.


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.

resources :

Montgomery, Douglas (2005). Introduction to Statistical Quality Control. John Wiley & Sons, Inc. ISBN 978-0-471-65631-9


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Posted by on 18/01/2013 in Uncategorized


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