1
Define purpose, scope, and covered incident types
Write a one-paragraph scope statement naming every system, data type, and incident category the plan covers. Be specific β 'all cloud-hosted systems processing customer PII' is actionable; 'all company systems' is not.
π‘ Align your incident types to the threat categories in your most recent risk assessment so the plan addresses real, prioritized risks.
2
Build the incident classification matrix
Define four severity levels (P1βP4) with concrete examples, maximum response time targets for each level, and the notification chain that each level triggers.
π‘ Use past incidents or near-misses as calibration examples β they make the severity definitions credible and immediately understood by the team.
3
Assign roles with named individuals and backups
List every IRT role, the primary person filling it, their contact details, and a named backup. Include external contacts β legal counsel, cyber insurer hotline, forensics vendor β in the same table.
π‘ Store this contact sheet separately from the main document and keep a printed copy in a physically accessible location in case systems are unavailable.
4
Document detection and reporting channels
Specify at least two reporting channels (e.g., email and a phone hotline), the incident report form location, and the acknowledgment SLA the IT Lead must meet.
π‘ Test the reporting channels quarterly β a broken email alias or unmonitored inbox is the most common reason incidents go unreported for hours.
5
Write containment and eradication procedures for your top three threat scenarios
Draft specific step-by-step procedures for your most likely incident types β ransomware, phishing-triggered account compromise, and accidental data exposure cover most organizations. Generic procedures are better than none but scenario-specific playbooks cut response time significantly.
π‘ Reference your actual tools by name (e.g., 'disable the host in CrowdStrike' rather than 'isolate the system') so on-call staff can execute without interpretation.
6
Prepare communication templates in advance
Draft customer notification emails, internal status update templates, and a holding statement for media inquiries before an incident occurs. Have Legal pre-approve the templates so approval time during an active incident drops to near zero.
π‘ Regulatory notification deadlines β 72 hours under GDPR, as soon as practicable under many US state laws β start from when you become aware of the incident, not when you finish your investigation.
7
Define the post-incident review cadence and outputs
Specify who chairs the review, the deadline (5β10 business days after closure), the required outputs (Post-Incident Report, corrective action list), and where these are stored.
π‘ Track corrective actions in your project management tool with due dates and owners β items logged only in a PDF report are almost never completed.
8
Schedule a tabletop exercise within 30 days of finalizing the plan
Run a 90-minute facilitated walkthrough of a realistic scenario with all IRT members. Document gaps identified and update the plan before filing it as active.
π‘ Use an external facilitator for the first tabletop exercise β they ask questions the internal team has normalized and will not think to raise.