The tests industry, which includes hardware, factory production, systems, science, art, and software use the terms QA and QC differently, as several of the posting indicate. IEEE, CMU, ISO, and other standards bodies do offer definitions, but many people disagree with the standards or even if there should be standards (e.g. STOP ISO29119). One reason to have standards and standards bodies is to try to reach common and agreed to terms/usage. This has started but will continue to be a rocky road as the usage does vary. I would refer authors to check the standards, define the disagreements locally if needed, and the work to reach common ground, maybe into standards. This will take generations of testers.