Quality is a very broad subject in apparel manufacturing as it involves both process and product as you will learn later. But it basically constitutes the characteristics of a commercial good that determines its desirability and which can be controlled by a manufacturer to meet certain basic requirements.
Importers typically conduct quality investigations services at various stages of production or shipping, including raw materials. Apparel textiles, accessories, and other textile products are evaluated for quality during production and in the preproduction phase with final inspection after the product is completed.
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Quality Assurance is focused on the process: It builds quality at each stage of the manufacturing process, including designing, production, and beyond.
Quality Control is focused on the product: It is generally understood as assessing the quality of products after manufacturing has been completed and categorized into acceptable and unacceptable categories. Where the actual result is examined to ensure that things are expected.
Reviewing the quality of items and components that have already been completed. QC inspectors should check already completed samples and check for defects. A full review of what types of samples were drawn and what defects were found in those samples.
This kind of inquiry typically takes longer than the more common final random inspection (FRI) and should be completed by inspectors with many years of experience in production monitoring.