Human Factors Engineering
Usability Engineering (IEC 62366-1)
What a definition is not
A definition is SPEQ’s plain-language decode of how a term is used in practice, cited to the documents that define it. It is a practitioner reference, not legal or regulatory advice, it does not replace the definition in the source, and where a regulator’s wording differs the regulator’s wording governs.
Usability engineering is the structured process of analyzing, specifying, developing, and evaluating a medical device’s user interface for use-safety — identifying use errors that could cause harm and designing the interface to eliminate or reduce that risk. IEC 62366-1 defines the process; formative and summative usability studies with representative users are its primary evidence.
The process starts with a use specification (intended users, use environments, and use scenarios) and a use-related risk analysis identifying critical tasks — tasks that, performed incorrectly or not performed, could cause serious harm. Formative evaluations run early and iteratively to shape the interface; a summative (validation) evaluation runs on the final design with representative users performing critical tasks under conditions simulating actual use.
IEC 62366-1 is written as a companion to ISO 14971: use-related risks identified through the usability engineering file feed directly into the device’s risk management file, and residual use-related risk that cannot be designed out must be justified as acceptable through that same risk framework rather than through labeling and training alone.
FDA and EU MDR reviewers both expect a usability engineering file for devices with a user interface — the file documents the use specification, critical tasks, formative findings, and the summative study protocol, data, and conclusion that the final interface is safe for its intended users.
- —Governed by IEC 62366-1: use specification, critical tasks, formative and summative evaluation
- —Summative (validation) testing uses representative users on the final design
- —Feeds and is fed by the ISO 14971 risk management file
- —Residual use-related risk must be justified as acceptable, not just labeled around
- —Expected as a usability engineering file at both FDA and EU MDR review
IEC 62366-1:2015+A1:2020; FDA guidance “Applying Human Factors and Usability Engineering to Medical Devices” (2016); EU MDR 2017/745 Annex I §5.2/§14.2(c)
Frequently asked questions
What does Human Factors Engineering stand for?
Human Factors Engineering stands for Usability Engineering (IEC 62366-1).
What is Human Factors Engineering?
Usability engineering is the structured process of analyzing, specifying, developing, and evaluating a medical device’s user interface for use-safety — identifying use errors that could cause harm and designing the interface to eliminate or reduce that risk. IEC 62366-1 defines the process; formative and summative usability studies with representative users are its primary evidence.
Which regulations cover Human Factors Engineering?
IEC 62366-1:2015+A1:2020; FDA guidance “Applying Human Factors and Usability Engineering to Medical Devices” (2016); EU MDR 2017/745 Annex I §5.2/§14.2(c)