What approach is NOT appropriate for detecting nonconforming goods or services schemes?

Collecting customer feedback on satisfaction is not typically an effective approach for detecting nonconforming goods or services schemes. This method primarily gauges the subjective experiences and perceptions of customers regarding the products or services they received. While customer feedback can indicate dissatisfaction that might arise from nonconforming goods, it does not provide the rigorous examination needed to directly assess compliance with specifications or standards.

In contrast, the other approaches are more aligned with objective evaluations and standards that can help identify discrepancies between what was promised and what was delivered. Reviewing contractor statements and claims, examining specification compliance documents, and testing received products for compliance all involve a thorough interrogation of processes and tangible results, making them more robust for uncovering potential fraud related to nonconforming goods or services.