Formative and Summative Evaluation – Medical Device Usability

Formative and summative evaluation are essential parts of the usability engineering process under IEC 62366. Manufacturers must conduct formative and summative evaluation to identify, reduce, and control use-related risks in medical devices.

Formative and Summative Evaluation Overview

Formative evaluation is performed during development to identify usability risks early. It is iterative and may involve internal teams or representative users. Common methods include cognitive walkthroughs and simulated use testing. Formative and summative evaluation at this stage helps refine design and mitigate foreseeable use errors.

Summative evaluation is conducted at the final stage to validate that users can operate the device safely without critical use errors. It must involve actual end users in real-use environments. As per Food and Drug Administration guidance, at least 15 users per user group are typically recommended.

Effective formative and summative evaluation ensures medical device safety, regulatory compliance, and successful market approval.