A critical incident debriefing checklist walks a facilitation team through the seven-phase Mitchell group process used after events like line-of-duty deaths, mass casualty incidents, or workplace violence. Before working through the phases, know this: major systematic reviews have found no evidence that single-session debriefing prevents PTSD, and some studies suggest it can worsen outcomes. Run it as one voluntary piece of a broader support plan, never as a mandatory standalone fix.
Before You Run One
A Cochrane systematic review of randomized controlled trials concluded that single-session individual debriefing “did not prevent the onset of post traumatic stress disorder nor reduce psychological distress” and that “compulsory debriefing of victims of trauma should cease.”1Cochrane. Psychological Debriefing for Preventing Post Traumatic Stress Disorder (PTSD) One trial in that review found a significantly increased risk of PTSD in the debriefed group. The World Health Organization recommends against single-session psychological debriefing as a trauma intervention.2National Library of Medicine. Critical Incident Stress Debriefing: A Systematic Review
The criticism targets mandatory, single-session debriefings that push emotional processing on a fixed timeline. Organizations that use the Mitchell model typically embed it within a broader Critical Incident Stress Management (CISM) program with pre-incident training, individual peer support, and follow-up services. Psychological First Aid, which does not require participants to recount emotional reactions, is the approach currently favored by most international guidelines, though it also lacks strong effectiveness evidence.3Frontiers in Psychology. Psychological First Aid
If you decide to proceed, keep participation voluntary and treat the session as one component of ongoing support.
When to Call a Debriefing and When Not To
The process is designed for events that overwhelm a group’s normal ability to cope. Typical triggers include the death or serious injury of a colleague, a mass casualty event, workplace violence, a suicide connected to the team, a natural disaster response, or an incident with significant threat to life. Multiple people should have shared the same overwhelming experience.
Do not run a session while an active threat continues, or in the first few hours when participants are still in acute shock. Do not mix people with very different levels of exposure in the same group. Someone who performed CPR on a colleague and someone who only heard about the incident later have different needs, and grouping them can harm both. People who are actively suicidal or in psychiatric crisis need individual clinical care, not a group process.
Pre-Session Checklist
Most debriefings that go wrong go wrong before anyone sits down. Work through the following before scheduling.
Facilitation Team
A debriefing team typically pairs a trained mental health professional with one or more peer support personnel who understand the operational culture of the group. The International Critical Incident Stress Foundation offers specialty certifications across tracks including emergency services, healthcare, schools, and workplace settings, requiring coursework in group crisis intervention and individual crisis support plus a specialty module.4International Critical Incident Stress Foundation, Inc. Certificate of Specialized Training Program Requirements Brief the team on the specific nature of the incident before the session so they can anticipate likely reactions.
Timing
Most CISM protocols recommend scheduling the session between 24 and 72 hours after the incident. Sooner risks running the session while participants are still in acute shock. Later, the window for group-based acute intervention closes as individuals form their own coping patterns.
Location
Choose a private space away from the scene, free from interruptions. A conference room in a separate building works. A room with a view of where the event happened does not. Silence phones, exclude outside personnel, and arrange seating so participants can see each other without a formal head of the table. Have water, tissues, and printed handouts on common stress reactions on hand.
Participants
Invite everyone directly involved in or who witnessed the incident. Exclude supervisors who will later evaluate participants’ performance, media personnel, and anyone attending in an investigative capacity. Attendance must be voluntary. Mandating it undermines the psychological safety the process depends on and contradicts every major review of the evidence.
The Seven Phases
The Mitchell model moves participants gradually from cognitive recounting into emotional engagement and back to cognitive grounding. The facilitator controls pacing and transitions. Rushing through phases or skipping re-entry are common mistakes that leave people emotionally activated with no closure.
Phase 1: Introduction
Welcome participants, introduce the team, and explain what the session is and is not. It is not therapy, not an investigation, and not a critique of anyone’s performance. Set ground rules: speak one at a time, respect different perspectives, do not interrupt or judge. State confidentiality expectations along with their realistic limits (covered below). Say plainly that no one will be forced to speak.
Phase 2: Fact Phase
Each participant gives a brief, objective account of what happened from their perspective. Where were you when it started? What did you see and hear? What did you do? Keep the discussion strictly factual. Emotional reactions come later, and jumping ahead derails the process. This cognitive recounting anchors fragmented individual memories into a shared narrative.
Phase 3: Thought Phase
Participants describe their first thoughts or most prominent thoughts during the incident. “I thought we were all going to die” and “I couldn’t figure out what was happening” are common. This phase bridges from facts to feelings. Do not challenge or interpret; use clarifying questions to help participants articulate what was going through their minds.
Phase 4: Reaction Phase
This is the emotional core and typically the most intense portion. Participants describe what the worst part of the experience was for them. Fear, helplessness, guilt over actions taken or not taken, grief, and anger are all common. Create space for these reactions without letting any single participant’s distress overwhelm the group. Watch for anyone who shuts down or dissociates. Those participants may need individual follow-up afterward.
Phase 5: Symptom Phase
The transition back toward cognitive ground begins. Participants identify physical, cognitive, emotional, and behavioral changes they have noticed since the event: sleep disruption, intrusive thoughts or images, difficulty concentrating, irritability, appetite changes, hypervigilance. Gather these so the next phase addresses what people are actually experiencing rather than a generic lecture.
Phase 6: Teaching Phase
Use the symptoms just identified to normalize what participants are going through. The core message is that these are normal reactions to an abnormal event, not signs of weakness or mental illness. Most acute stress symptoms resolve within a few weeks of a traumatic event.5U.S. Department of Veterans Affairs. How Does PTSD Develop and How Long Does it Last? Introduce practical coping strategies: regular sleep and eating patterns, physical activity, limiting alcohol, talking to trusted people, returning to normal routines where possible. Explain the warning signs that would suggest someone needs professional help beyond the debriefing.
Phase 7: Re-Entry
Close loose ends. Summarize key themes, ask whether anyone has unresolved questions, and provide specific referral information for ongoing support, such as an Employee Assistance Program or community mental health services. Hand out written contact details for crisis lines and the debriefing team. Reinforce that seeking additional help is not a sign of failure. End with a clear sense of closure rather than trailing off.
Confidentiality Limits to Disclose Up Front
Facilitators routinely tell participants that everything shared in the room stays in the room. The reality is more complicated, and organizations that promise absolute confidentiality set themselves up for problems.
Federal courts have refused to recognize a blanket privilege for CISD communications. In a 2023 civil liability case involving the Boston Police Department, a U.S. District Court ordered disclosure of communications made during debriefing sessions. The court rejected claims of therapist privilege, counsel privilege, and Employee Assistance Program privilege, noting that because the sessions were explicitly classified as “not therapy,” they could not claim the protections that attach to therapeutic relationships.6International Association of Chiefs of Police. Current Court Challenges Involving Critical Incident Stress Debrief Confidentiality A state criminal case involving the Vancouver, Washington Police Department reached the same conclusion.
Many states have enacted peer support confidentiality statutes, but they vary widely in scope, and courts do not always find them controlling. Tell participants at the outset that the team will protect confidentiality to the greatest extent possible but that statements could potentially be compelled through legal process. Anyone facing civil or criminal litigation related to the incident should consult an attorney before participating.
Paying Employees for Attendance
If an employer directs employees to attend a debriefing during work hours, the time is compensable. The trickier question arises when sessions fall outside normal hours. Under the Fair Labor Standards Act, attendance at meetings and similar activities is non-compensable only if all four of these criteria are met: the session is outside normal hours, attendance is truly voluntary, the session is not directly job-related, and no other work is performed during it.7U.S. Department of Labor. Fact Sheet 22: Hours Worked Under the Fair Labor Standards Act (FLSA)
A debriefing following a workplace incident almost certainly fails the “not job-related” test, and may fail the “voluntary” test if there is any implicit or explicit pressure to attend. When any one criterion is not met, the time is compensable. Budget for pay, including overtime for nonexempt employees where applicable. Getting this wrong stacks wage-and-hour liability on top of whatever crisis prompted the debriefing.
What to Document and What Not To
Documentation creates tension the organization should work through before the session, not after. Tracking attendance and referrals supports duty of care and helps identify individuals needing follow-up. But because courts have compelled disclosure of CISD communications, detailed session notes can become evidence in litigation.
A conservative approach records only the date, time, and location of the session, the names of facilitators, the general nature of the incident, an attendance list, and whether any individual was referred for additional support. Do not document the specific content of what participants said. Consult legal counsel to establish documentation policies before an incident occurs, when decisions can be made deliberately rather than reactively.