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What is it: Patterns are helpful in solving quality-related problems too and one of the best tools for displaying a pattern is the defect concentration diagram. Defect concentration diagrams are the embodiment of the old adage: "A picture is worth a thousand words." A defect concentration diagram is a visual data display tool that literally shows where defects or problems are concentrated. Seeing the pattern of defects can often be the catalyst to get to the root cause(s) of a problem and ensure the problem is solved for good. Since concentration diagrams literally paint a picture of the problem, they are one of the most powerful data collection/display/analysis tools we have. Unfortunately, they are one of the most underutilized tools as well.

In an electronics assembly factory, the inspector at the end of a production line of printed circuit board assemblies would have a picture or drawing of the printed circuit board showing all the various components etc. When they found a fault, they would simply mark the faulty component on the drawing, creating over a week a simple analysis of where the faults were occurring. Their great advantage is that the data becomes easy to collect and then needs little or no analysis - the diagrams are almost self analysing.

What is it used for: To show the location of errors or defects.

Why use it: To determine were the faults are occuring on the production part.

Where to use it: Proceeding any operation.

When to use it: For either capturing or displaying defects data that can be segregated by location. This can show which location to focus efforts on.

How to use it: Concentration diagrams are incredibly easy to use; data collection and data analysis are both a snap and are done in just one step, not two separate steps. There is no need to develop forms to collect data; depending on the scope of the study, a print of the part, a map of the area or a copy of a procedural form can be used to collect the data. 

Step 1 - Define the fault or faults (or whatever) being investigated.

Step 2 - Make a map, drawing, or picture.

Step 3 - Mark on the diagram each time a fault (or whatever) occurs and where it occurs.

Step 4 - After a sufficient period of time analyse it to identify where the faults occur. Perhaps simply when a pattern starts to develop, that it can be identified.

Important Notes: This can be used for products, processes, or even plant locations.


  Name
Format
Preview (Click to enlarge)
  Defect Concentration Diagram Template
Microsoft Excel Format
Microsoft Excel
Format
Defect Concentration Diagram Template
  Defect Concentration Diagram Example
Microsoft Excel Format
Microsoft Excel
Format
Defect Concentration Diagram Example
  Defect Concentration Diagram Instructions
Microsoft Excel Format
Microsoft Excel
Format
Defect Concentration Diagram Instructions
USD $14.95
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