Any large event requires a deliberate process to minimise the unexpected and uncontrolled environment. The system commences with a risk assessment followed by liaison, coordination, communication and contingency planning.

• 任何大事件要求慎重行动以减少不能预料的和不能控制的情形。系统的启动从危险评估开始,随后要有联络、合作、沟通和应变计划。