Every company and authority can be affected by IT emergencies, resulting in massive losses and damages. No matter what preventive measures are taken, emergencies cannot be completely ruled out. Therefore, it is essential to establish a robust emergency organization, conduct emergency training, and act purposefully and effectively when an emergency occurs. The orderly restoration of supplies, systems, and applications must be achieved to return to normal as quickly as possible. The book systematically introduces all aspects of the topic based on a practical report, covering, among other things, Business Impact Analysis, alignment with ISO 27001 and IT baseline protection, as well as the entire documentation of emergency management.