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Supplier Quality Surveys - You're probably doing it wrong

I've seen a large number of Supplier Quality Surveys (e.g., “Supplier Evaluation Survey”) completed by suppliers (i.e., a self-assessment) and provided to potential customers as a basis for “qualifying” (i.e., “approving”) them as a supplier.

First and foremost (I must state the obvious), since these surveys are typically completed by the supplier… they're simply not objective.

Second, the VAST majority of these surveys ask questions regarding the existence of certain quality controls - and are completely worthless because the questions fail to address (1) the effectiveness of those controls, and (2) rarely require any records to be submitted supporting their effectiveness.

For example:

CORRECTIVE ACTION
Is a documented process(s) maintained for implementation of corrective actions?
Does the process provide for problem analysis and determination of root cause(s)?
Are controls established to ensure that corrective actions taken are effective?