The Pre-Production Inspection (PPI) is a type of quality control inspection conducted before the production process begins to assess the quantity and quality of the raw materials and components, and whether they are in conformity with product specifications.

A PPI could be beneficial when you work with a new supplier, especially if your project is a large contract that has critical delivery dates. It is also very important in any case where you suspect the supplier has sought to cut his costs by substituting cheaper materials or components prior to production. This inspection also can reduce or eliminate communication issues regarding production timelines, shipping dates, quality expectations and others, between you and your supplier.

During production inspection (DPI) also known as DUPRO, is a quality control inspection conducted while production is underway. This step is particularly useful for products that are in continuous production that have strict requirements and when quality issues have been found prior to manufacturing during an earlier PPI. DPI inspections take place when only 10-15% of units are completed so that any deviations can be identified, have feedback given, and any defects can be re-checked to confirm they have been corrected. It enables you to confirm that quality, as well as compliance to specifications is being maintained throughout the production process. It also provides early detection of any issues requiring correction, thereby reducing delays and rework.

Pre-shipment inspections (PSI) are an important step in the quality control process and the method for checking the quality of goods before they are shipped. PSI ensures that production complies with the specifications of the buyer. This inspection process is conducted on finished products when at least 80% of the order has been packed for shipping. Random samples are selected and inspected for defects against the relevant standards and procedures.

Container loading and unloading inspections ensure your products are loaded and unloaded correctly. Inspectors will supervise throughout the whole process and ensure your products are handled professionally to guarantee their safe arrival to their final destination.

This inspection will usually take place at your chosen factory while the cargo is being loaded into the shipping container and at the destination, once the products have arrived and are being unloaded. This process includes evaluating the condition of the shipping container, verifying all the product information, quantities, and packaging compliance.

In addition to the four types of quality inspections above, another procedure also exists. A piece-by-piece inspection involves checking each and every item to evaluate a range of variables including general appearance, workmanship, function, and safety. This inspection process can be carried out either before or after the packaging inspection. In the circumstance where the goods require particular attention to ensure compliance to specification or when the goods are high-value, a 100% inspection service should be performed.