The idea of Work Safety is practically synonymous with ergonomics.
By scrutinizing every facet of a workplace, its equipment, organization, task distribution, staffing, shift lengths, stresses, etc. all while keeping human physiology and limitations in mind, ergonomists decide what is safe and unsafe. Pre-empting safety hazards, prevents accidents from ever happening. Accidents & hazards which can range from overloads of stress, to permanent skeletal damage, even to death. Such safety is measured in terms of reduced harm and requires coordination with other Health & Safety officials