This guidance describes the stages that should be considered in carrying out a Task and Resource Analysis (TRA) to establish justification as to the minimum number of qualified/competent personnel required to deliver an effective Airport Rescue and Fire fighting Service (RFFS) to deal with an aircraft incident/accident. If it is required for the RFFS to attend structural incidents and road traffic accidents in addition to aircraft incidents/accidents due regard must be given to the inability of not meeting required response times and robust procedures should be introduced accordingly.