How we can develop preventive measures

The preventive measures we can developed only when sufficient knowledge about the hazards,source of accident etc. So we must try to collect maximum data and analysis  the data. The cause of accident can be obtained from the group of common factors lading to similar accident accident.Knowledge of unsafe act & unsafe conditions,types of human failure and the root cause etc. are Important for studying the causation of accident.So the analyst must a competent person .We need past accident records and data's ,collect the preventive measures for studying .So we collect the accident data's from other similar nature of industries,after the analysis of data's and investigation reports give the root cause and sub cause of potential danger or symptoms behind accident.