During Production Check (DUPRO) is a quality assurance process that is conducted during the production process in order to ensure that products meet quality standards and requirements. The process involves monitoring, inspecting, and testing each product before it is released to the customer. This includes checking for defects, ensuring that the product meets its specifications, and verifying that the product is safe for use. The process also helps to identify any issues that may arise during the production process and can help to prevent product defects from reaching the customer.