A QA matrix is a table that delineates how defects are being built into products under current conditions, in a process in which one wishes to assure quality.

This matrix enables managers to see at a glance which processes are generating defects, which processes’ equipment and methods are faulty, and how these two are related.

This step draws up a QA matrix (see Figure “Example of QA Matrix”) that analyses the relationships between the individual processes and defect modes identified in Step 1. This allows us to identify the processes in which defects that impair quality occur and understand what kinds of flaws will arise if specific equipment or method conditions are not observed. At the same time, we analyze records of defect modes and their seriousness.

QA Matrix Item: Ordinary PVC

Example of QA Matrix

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