The infrastructure of large cities is getting more and more vulnerable to natural and man-made disasters.
Complex ICT infrastructures, critical dependencies and unforeseen cascading effects can aggravate single hazard events to a threatening crisis of whole infrastructures. With the dense population and the critical dependency on infrastructures, such crises become a serious threat to the safety and security of citizens and industries. When the "unforeseen" happens, public security comes to its limits. Whether cyber, natural or industrial disasters - effective risk management must be a continuous process that recognizes new threats and opportunities, in particular in relation to new technological evolutions.