Defect concentration diagram

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[edit]

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[edit]

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

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

References[edit]

^ 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

[ASQ_PCD-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

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