Root cause analysis supplier

Auditor has to advise supplier to conduct root cause analysis on all NCs. 

Supplier quality system survey Continuous improvement Supplier visit Root cause analysis... 

When we look at the factors that are identified in the interviews, we can see that the different factors, and hence, the related explicit uncertainty that is caused by them, can all be related to the different stages of the product lifecycle as, for example, defined by Bedford, Quigley and Walls (Bedford et al. 2006), i.e. concept and definition, design and development, manufacturing and installation, operation and maintenance. We see for example that the concept root-cause analysis (here, uncertainty is caused by this concept because we do not know the extent to which we are able to find the root-cause) can typically be related to the operation and maintenance phase. On the other hand, the concept supplier management (here, uncertainty is caused by the unknown level of quahty with which supplier management is applied) typically relates to the design and development phase. 

The causes of low pressure, for example, could be cither hydraulic or mechanical. In many cases of failure analysis, asking Wliy. and Wliat and answering those questions, until you can no longer ask why , will almost always get you to the answer. If all evidence leads to a mechanical reason for the failure, the problem is probably maintenance induced. If the evidence leads to a hydraulic reason for the failure, the problem is eitJier operations or design induced. In cases where the reason for failure was not determined, a more extensive analysis is necessary. The additional analysis is recommended to take advantage of the pump supplier experience in identifying the root cause. 

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