Peter Gear WAO 98 Abstract The Main Control Room acts as the focal point for all activities associated with the ISIS Facility. The operational shift teams have, as a result, additional responsibilities, above those associated with operating and the control of the accelerators. These include providing support and assistance to the large number of users (experimenters), acting as a co-ordinators for maintenance tasks and ensuring that all work is undertaken according to laid down safety rules and procedures. The Duty Officer (shift leader) has executive responsibility for safety throughout the Facility and will issue Permits to Work including - in his role as a Radiation Protection Supervisor - Radiation Permits to Work. These additional responsibilities are the subject of this talk.