= The contact list is the most important element of the escalation procedures for an incident response plan, as it ensures that the appropriate stakeholders are notified and involved in the incident management process. A contact list should include the names, roles, responsibilities, phone numbers, email addresses, and backup contacts of the key personnel involved in the incident response, such as the incident response team, senior management, legal counsel, public relations, law enforcement, and external service providers. The contact list should be regularly updated and tested to ensure its accuracy and availability123. References =

1: Information Security Incident Response Escalation Guideline2, page 4

2: A Practical Approach to Incident Management Escalation1, section “Step 2: Log the escalation and record the related incident problems that occurred”

3: Computer Security Incident Handling Guide4, page 18