What are the differences between Pre-Shipment Inspection (PSI) and During Production Inspection (DUPRO)?

Some sort of larger quantity orders have to be processed with continuous production lines.

Suppose that as an exporter you have received an huge order from Libya consists of 6,000mtons of refined sunflower oil packed in 1 Lt pet jars.

Assume that your factory can process 150mtons of refined sunflower oil per day in requested package type. You need 40 working days to complete the production of the order.

Continuous production requires day to day quality control checks, as it is possible to see deviations from the product specifications from one batch to another.

The only way to eliminate quality fluctuations under continuous production is to monitor the process daily by a qualified personnel.

In such a situation, importer company has two alternatives, either sending one or two engineers to the exporting company within their organization to follow up the production, or else sign a During Production Inspection (DUPPO) agreement with one of the independent audit companies.


Today I would like to explain the differences between During Production Inspection (DUPRO) and Pre-Shipment Inspection (PSI).