中阶

• For instance , if middle management has an identified responsibility to ensure the operation of an incident reporting system then it is possible to place any causal factor that relates to the failure of such a system at this level in a tier diagram
  这些原则是由判断应用流程作业的安全事件所得来。例如：如果中阶管理者有责任确保事件通报系统的作业，那么可能会放置任何与系统错误相关的因果要素在层叠图中。