User interface of unknown provenance (UOUP)

Legacy devices often have a UOUP. IEC 62366-1 Annex C gives a simplified process for them that relies on post-production information instead of repeating the full usability engineering process.

USER INTERFACE or part of a USER INTERFACE of a MEDICAL DEVICE previously developed for which adequate RECORDS of the USABILITY ENGINEERING PROCESS of this standard are not available

IEC 62366-1:2015+AMD1:2020, clause 3.15