First aid may be administered by the first person 'on the spot'. It is generally recognised, however, that a first aider is a person who has had some level of formal training. First aiders may have skills that range from basic expired air resuscitation (EAR) or cardio-pulmonary resuscitation (CPR) to being able to provide more complex treatment.
Selection and training of first aid personnel is most important. First aiders should be familiar with the specific conditions and hazards at the workplace and the types of injuries likely to require treatment. The level of training that is needed should be determined according to the hazards identified at the workplace and the assessed risks.