The ISO definition of quality control (QC) is: “part of quality management focused on fulfilling quality requirements”.

Quality management emphasises the monitoring and control of a process that is producing a product or service.  This may mean an entity has to analyse all aspects involved in production, and ensure they are fulfilling requirements. 

Quality control is a set of procedures to ensure that a product or service adheres to a defined set of quality criteria or meets the requirements of the customer.