key personnel

This term is defined in ECSS-Q-ST-70-10C as
personnel with specialist knowledge responsible for defined production or product assurance areas

This term is defined in ECSS-Q-ST-70-11C as
personnel with specialist knowledge responsible for defined production or product assurance areas

This term is defined in ECSS-Q-ST-70-60C as
personnel with specialist knowledge responsible for defined production or product assurance areas