How to ensure quality of material while procuring through open competition on Generic Specifications basis?

This can be done as follows :1- Second party audit ( customer audit )2- Incoming inspection plan acc.to the suitable standard3- Frequent visits during producing our lots

This can be achieved through getting the compliance signed off by the suppliers and through asking the suppliers to submit the samples.

Clear accept and reject criteria parameters must be in place. This will be dependent on product type.