Fall arrest is the form of fall protection which involves the safe stopping of a person already falling. It is one of several forms of fall protection, forms which also include fall guarding (general protection that prevents persons from entering a fall hazard area e.g., guard rails) and fall restraint (personal protection which prevents persons who are in a fall hazard area from falling in the first place, e.g., fall restraint lanyards). The U.S. Department of Labor's Occupational Safety and Health Administration specifies under Title 29 of the Code of Federal Regulations that individuals working at height must be protected from fall injury, and fall arrest is one of several forms of fall protection as defined within that Code. Personal fall arrest systems Fall arrest is of two major types: general fall arrest, such as nets; and personal fall arrest, such as lifelines. The most common manifestation of fall arrest in the workplace is the Personal Fall Arrest System, or PFAS ("lifeline"). Such a system should include 5 elements referred to as ABCDEs of Fall Arrest: A – Anchorage – a fixed structure or structural adaptation, often including an anchorage connector, to which the other components of the PFAS are rigged. B – Body Wear – a full body harness worn by the worker. C – Connector – a subsystem component connecting the harness to the anchorage – such as a lanyard. D – Deceleration Device – an essential subsystem component designed to dissipate the forces associated with a fall arrest event. E – Emergency Plan & Equipment – a clear and simple approach to rescue of a suspended worker following a fall arrest event. All workers should be familiar with the site-specific plan and able to both comply with and implement it. This includes aiding others, as in recovery of a suspended co-worker before "suspension trauma" sets in. Each of these elements is critical to the effectiveness of a personal fall arrest system. There are many different combinations of products that are commonly used to assemble a personal fall arrest system, and each must meet strict standards. The specific environment or application generally dictates the combination or combinations that are most appropriate. Fall protection training Workers are required to have training in the use of fall protection equipment. This is legislated by Occupational Health and Safety Groups such as OSHA in the USA, and in Canada, the Provincial legislative