Defect concentration diagram
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.
![](../I/m/Snow-cholera-map.jpg)
Concentration diagram of Cholera deaths 1854 in London (John Snow (1813-1858))
Usage
Defect concentration diagram is used effectively in the following situations:
- During data collection phase of problem identification.
- Analyzing a part or assembly for possible defects.
- Analyzing a product (or a part of a product) being manufactured with several defects.
Steps
There are a number of steps that are needed to be follow when constructing the defect concentration diagram:
References
- Bjørn Andersen, Tom Fagerhaug, and Marti Beltz, Problem Concentration Diagram, on https://ASQ.org; read 20. August 2015.
- Douglas Montgomery (2005). Introduction to Statistical Quality Control. John Wiley & Sons, Inc. ISBN 978-0-471-65631-9
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