the starting point for specifying the system is a set of abstract organisational needs and constraints.
the organisation buying the system requires that it should operate safety and reliably without causing injury to its operator.
safety in the organisation is the responsibility of a safety officer.
he or she requires the system manufacturer to take a systematic approach to safety issues.
these include:
identifying hazards, risks and risk criteria.
identifying the necessary risk reduction to meet the risk criteria.
defining the overall safety requirements specification for the safeguards necessary to achieve the required risk reduction.