In medical device design, technical efficacy is only half the battle. A device can be engineering perfection, but if a clinician or patient misinterprets a screen prompt or a physical control, the result can be catastrophic use error.
This is where IEC 62366-1 comes into play. It is not an optional layout framework; it is a globally harmonized international standard that mandates a structured Usability Engineering Process (also known as Human Factors Engineering) throughout the entire product development lifecycle. If you are pursuing an EU MDR CE mark, UKCA marking, or an FDA 510(k) clearance, establishing explicit compliance with IEC 62366-1 is a fundamental requirement for market access.