A committee draft (CD) of “IEC TR 62366-2: Medical devices – Part 2: Guidance on the application of usability engineering to medical devices” was issued for comment. This technical report provides medical device manufacturers with guidance on how to integrate usability engineering (also called human factors engineering) principles and user interface design practices into their overall medical device development processes. It focuses not only on usability as it relates to safety, but also on how usability relates to attributes such as task accuracy, completeness and efficiency, and user satisfaction. This is a companion document to IEC 62366-1, which is currently out for final (FDIS) ballot.