A contact tree must say who activates it and why
A list of phone numbers is not a contact tree. Define the events that activate notification, the role authorized to begin it, the first message, who acknowledges receipt, the fallback when someone does not respond, and who closes the loop. Emergency services should be contacted directly when needed rather than delayed by an internal chain.
Organize contacts by role and decision
- Immediate response: local emergency services, site address, and the person directing evacuation or shelter actions.
- Operational control: manager, facilities, IT, alarm, utility, landlord, or key contractor appropriate to the event.
- People support: staff accountability, medical support process, accessibility support, and family communication policy.
- Continuity: insurer, critical supplier, alternate site, records owner, and approved public communication role.
Store only necessary personal information and limit access. Do not publish staff home details in a customer-facing document.
Write one message that reduces confusion
Include action, location, time, and next update
A useful message states what staff should do now, which site or shift is affected, when the instruction began, and where the next confirmed update will appear. Avoid speculation and do not circulate identifying information that people do not need.
The workplace incident plan helps define activation thresholds. The lone worker safety plan covers missed check-ins and situations where no nearby coworker can verify status.
Test acknowledgment and fallback
Run an announced test that does not simulate violence or create distress. Measure whether the designated initiator had current access, whether each branch acknowledged, how long unresponsive contacts delayed the chain, and whether alternate formats worked for staff needs. Update after staffing, vendor, site, or system changes and set a scheduled review owner.