The type of intervention used depended on the situation, the number of people involved, and their proximity to the event. One form of intervention was a three-step approach, whereas different approaches include as many as five stages. However, the exact number of steps is not what is important for the intervention's success. The goal of the intervention is to address the trauma along the general progression: defusing, debriefing, and followup.
Defusing A defusing is done the day of the incident before the person(s) had a chance to sleep. The defusing was designed to assure the person or people involved that their feelings are normal, to tell them what symptoms to watch for over the short term, and to offer them support, usually in the form of contact with a
peer support person from their organization. Defusings are used to support groups, not individuals, who have shared the same traumatic experience. Never is a defusing done at the scene of an incident as this would violate the CISM principle of not interfering with operations. The purpose of a defusing is to assist groups in coping in the short term, address acute needs, facilitate a normalization of any symptoms that arise, and bring awareness of available resources if difficulties are encountered.
Critical Incident Stress Debriefing Critical incident stress debriefing (CISD) is a controversial component of CISM, and research suggests it may cause harm. ICISF specifies that defusings and debriefings are only intended for use with groups. The individual intervention technique used in CISM is a version of psychological first aid. A
literature review concluded that a primary flaw in criticism of CISM is "the lack of consistent terminology," which has led investigators to evaluate distinct interventions as if they were identical, and to use variable outcome measures, making it difficult to compare outcomes across different studies. The review authors concluded that CISM "should continue to be offered to secondary victims of trauma." For teams, group debriefings are suggested 48–72 hours after a critical incident giving the group an opportunity to support each other by talk about their experience, how it has affected them,
brainstorm coping mechanisms, identify individuals at risk, and inform the individual or group about services available to them in their community. The final step was to follow up with them the day after the debriefing to ensure that they are safe and coping well or to refer the individual for professional
counselling. CISM protocols clearly state that no one should ever be pressured or coerced to speak, contrary to some of the criticisms offered (e.g., one firefighter's account of CISM properly offered). Although many co-opted the debriefing process for use with other groups, the primary focus in the field of CISM was to support staff members of organizations or members of communities which have experienced a traumatic event. The debriefing process (defined by the International Critical Incident Stress Foundation [ICISF]) has seven steps: introduction of intervenor and establishment of guidelines and invites participants to introduce themselves (while attendance at a debriefing may be mandatory, participation is not); details of the event given from individual perspectives; emotional responses given subjectively; personal reaction and actions; followed again by a discussion of symptoms exhibited since the event; instruction phase where the team discusses the symptoms and assures participants that any symptoms (if they have any at all) are a normal reaction to an abnormal event and "generally" these symptoms will diminish with time and
self-care; following a brief period of shared informal discussion (generally over a beverage and treat) resumption of duty where individuals are returned to their normal tasks. The intervenor is always watching for individuals who are not coping well and additional assistance is offered at the conclusion of the process.
Follow-up The final step is follow-up and referral where indicated. This is generally done within a day, and done again the week following the debriefing, by team members as a check-in. This step identifies symptoms which may have developed or worsened over time. ==Research and Debate==