'Health Equipment Information' ('HEI') No. 101, published last year, contained a report on the UK Health Departments’continuing comparative evaluation programme of defibrillators. The programme is being carried out within the Sheffield and Rotherham Area Health Authorities; safety and performance are being assessed by the Department of Medical Physics and Clinical Engineering at Sheffield University and user assessments are being performed at two of the AHA's hospitals: the District General Hospital, Rotherham and the Royal Hallamshire Hospital, Sheffield.‘HEP No. 101 covers five models: Cardiac Recorders’2006; Datamedix's (Becton Dickinson)Stat VI(from Deva Medical Electronics Ltd); Hewlett-Packard's 78620 A; Physio-ControFs Lifepak 5; and Simonsen&Weel's DMS 600. Extracts from‘HEF No. 101 follow; the Editors are grateful for the DHSS's permission to publish this.