QA is process oriented while QC is product oriented. QA deals in developing processes and systems that aling with QMS. QC on the other hand deals with monitoring products. For example, a QA engineer would develop a quality plan based on customer requirements and the QC engineer would monitor and ensure that all requirements of the quality plan are met by the product during manufacturing. A QA engineer may be involved in developing packagung & shipping requirement or be involved in providing quality specifications to purchasing. The QC engineer would only be focussed on making sure product meets the requirements of quality plan as set by QA.