INTRODUCTION This guidance document is intended for conformity assessment bodies (CABs), notified bodies (NBs), designating authorities (DAs), and Joint Assessment Teams (JATs) involved in Regulation (EU) 2017/745 on medical devices (hereafter MDR) and Regulation (EU) 2017/746 on in vitro diagnostic medical devices (hereafter IVDR). It should be read in conjunction with the guidance document MD..