Medical Devices — Part 1: Application of Usability Engineering to Medical Devices
The international standard for usability engineering of medical devices (2015, amended by A1:2020). It defines a process for analysing, specifying, developing, and evaluating the usability of a device as it relates to safety: identifying hazard-related use scenarios, specifying the user interface, and evaluating it formatively during design and summatively at the end — so that use errors that could cause harm are engineered out rather than trained around. It completes the device-engineering triangle with ISO 14971 (risk) and IEC 62304 (software).
What this does not cover
stated in the document's own scope- Addresses normal use and use error; abnormal use — deliberate violation of the instructions — is explicitly outside the process's ability to control and is handled as a risk-management matter.
- A process standard for usability as it relates to safety; user-satisfaction or market-preference testing is not its object.
- Specifies the usability engineering process; the overall risk-acceptability framework it feeds belongs to ISO 14971.
Always verify against the current published text before relying on it for a submission or inspection.
Overview
IEC 62366-1 is the usability engineering standard for medical devices — the process by which a manufacturer analyses, specifies, develops, and evaluates a device's user interface as it relates to safety. Its object is use error: the standard drives identification of hazard-related use scenarios, specification of the user interface and of a usability evaluation plan, formative evaluation while the interface is being designed, and summative evaluation of the final interface to demonstrate that users can use the device safely. First published in 2015 — replacing the 2007 IEC 62366 and moving application guidance into the companion technical report IEC/TR 62366-2 — and amended by A1:2020, it is cited in its consolidated form as IEC 62366-1:2015+A1:2020.
Scope & applicability
Manufacturers applying usability engineering to medical devices, addressing normal use and use error; it does not cover abnormal use. Guidance on applying the process lives in the companion technical report IEC/TR 62366-2.
Legal basis & how it acquires force
An international consensus standard from the IEC, developed with ISO participation for medical-device usability. It is voluntary until invoked: it is harmonised/recognised in the major device jurisdictions, so conformance is the accepted route to meeting the human-factors expectations of EU device legislation and the corresponding regulatory guidance elsewhere. Its risk decisions are made within the ISO 14971 risk-management process rather than under a separate scheme.
Document structure
| Part | Covers |
|---|---|
| Use specification | Intended users, use environments, patient populations, and operating principles of the device |
| User interface characteristics and hazard-related use scenarios | Identifying safety-related characteristics and the use scenarios that could lead to harm |
| User interface specification and evaluation plan | Specifying the interface and planning formative and summative evaluation |
| Formative and summative evaluation | Iterative evaluation during design and the concluding evaluation of the production-equivalent interface |
| User interface of unknown provenance | The pathway for interfaces or interface elements developed before or outside the usability engineering process |
Key requirements
- A use specification defining intended users, use environments, and operating principles
- Identification of safety-related user-interface characteristics and hazard-related use scenarios
- A user interface specification and a usability evaluation plan
- Formative evaluation during development and summative evaluation of the final user interface
- Integration of use-error risk analysis with the ISO 14971 risk-management process
Implementation tips
- Select hazard-related use scenarios for summative evaluation by risk, and document the selection rationale — evaluating everything is infeasible and evaluating favourites is indefensible
- FDA's human-factors expectations and 62366-1 run on the same skeleton; one usability engineering file can serve both if the summative evaluation is designed to each audience's acceptance framing
Revision notes
IEC 62366-1:2015 replaced the 2007 edition's single-document approach (splitting guidance into IEC/TR 62366-2); Amendment 1:2020 clarified requirements and terminology, and the consolidated edition is cited as 62366-1:2015+A1:2020.
Where this control fails
live FDA enforcementLive FDA recalls SPEQ maps to this standard’s topics — a SPEQ interpretation, not an FDA classification.
International alignment
The standard completes the device-engineering triangle: ISO 14971 governs risk management, IEC 62304 the software life cycle, and 62366-1 the use-error dimension — its use-related risk analysis feeds the 14971 risk file rather than standing alone. IEC/TR 62366-2 carries the how-to guidance, IEC 60601-1 invokes usability for electrical medical equipment, and FDA's human-factors guidance describes the same engineering skeleton in the US submission context.
IEC 62366-1:2015+A1:2020: frequently asked questions
Quick answers to common questions about IEC 62366-1:2015+A1:2020.
What is the difference between formative and summative evaluation?
Formative evaluation happens during design — iterative checks that shape the interface as it develops. Summative evaluation is the concluding demonstration, on the production-equivalent interface, that users can perform the hazard-related tasks safely. Formative findings drive change; summative results are the evidence.
What does IEC 62366-1 mean by use error vs abnormal use?
Use error is an action, or omission, that leads to a different result than intended by the manufacturer or expected by the user — including slips and mistakes by competent users. Abnormal use is deliberate disregard of the instructions or contraindications; the usability process addresses use error, while abnormal use falls to risk management and labelling.
What changed with IEC 62366-1:2015 and the A1:2020 amendment?
The 2015 edition restructured the 2007 standard: the normative process became Part 1 and the application guidance moved into technical report IEC/TR 62366-2. Amendment 1:2020 clarified requirements and terminology, and the standard is now cited as IEC 62366-1:2015+A1:2020.
How does 62366-1 relate to ISO 14971?
Use-related risk analysis under 62366-1 is part of the device's ISO 14971 risk management: hazard-related use scenarios are identified and evaluated with the same risk concepts, and residual-risk decisions are made in the 14971 framework, not in a parallel usability scheme.
This standard in practice
Recall domain is a SPEQ mapping of this standard’s topics, not an FDA classification.