A safety-related system (or sometimes safety-involved system) comprises
everything (hardware, software, and human aspects) needed to perform one or more
safety functions, in which failure would cause a significant increase in the
safety risk for the people or environment involved.Safety-related systems are
those that do not have full responsibility for controlling hazards such as loss
of life, severe injury or severe environmental damage. The malfunction of a
safety-involved system would only be that hazardous in conjunction with the
failure of other systems or human error.