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The QM matrix is an essential tool to ensure the maintenance of the quality level. It summarizes all the elements to maintain to ensure quality over time.


The QM matrix for Quality Maintenance, is a matrix that will allow to visualize, for all the equipment parameters, the key elements to guarantee a good functioning.

We will find on this matrix :

  • Nominal values and their tolerances of critical parameters
  • The necessary measuring means
  • The people in charge of the measure
  • The control frequency

Associated with the QA matrix, we can guarantee the maintenance of the critical quality parameters while increasing the reactivity of the personnel in the resolution of the problems. 

1 – Identify the 5W2H of the quality criteria

At first, we will start by defining the different quality criteria. For this, we will rely on the tool 5W2H to define :

  • What is the setting ? Specify units of measurement. 
  • Who is eligible to check ? specify whether certification is required. 
  • Where is the check ? Specify whether a specific medium is needed. 
  • When is the check ? specify the frequency, the date … 
  • How is the check ? specify with which tool the control is done and the procedure to use it, as well as the detailed procedure of the control. The procedure must also specify what to do in the case where the control is not in conformity. 
  • How much do I need to get ? : Specify the target value sought and the associated tolerances.

2 – The 5 conditions for the 0 default

Once the quality parameters have been correctly defined, we will cross the information with the “5 conditions for the 0 defect”. In the form of 5 questions at 3 levels each, we will define the criticality level of the quality parameter and thus prioritize the improvement actions needed to ensure the quality.



1. Are the conditions clear ?

1. There is a defined and shared standard.

3. There is a control method.

5. Conditions are easy to understand and visualize.

2. Are the conditions simple to hold ?

1. Difficult to hold, there is no repository.

3. Easy to hold, there is a referentiel.

5. Present automatically.

3. Are the conditions variable ?

1. During normal production.

3. Only at start-up.

5. Unusually.

4. The conditions of variability are easily verifiable ?

1. Hardly visually.

3. There is a standard measurement system.

5. Check continuously.

5. Are conditions easy to restore ?

1. Request the intervention of a specialist.

3. A qualified operator can do it.

5. Automatically done.

 Sample matrix


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