A disaster recovery plan covers the data, hardware, and software critical for a business to restart operations in the event of a natural or human-caused disaster, including power failures, computer viruses, legal issues, and worker strikes. It should also include plans for coping with the unexpected or sudden loss of key personnel. The analysis phase in the development of a business continuity plan (BCP) manual consists of an impact analysis, threat analysis, and impact scenarios with the resulting BCP requirement documentation.