In the irst couple weeks after a mass trauma, brief versions of CBT may be helpful to some people who are having severe distress. Sometimes other treatments are used, but their effectiveness is not known. For example, there is growing interest in an approach called psychological irst aid. The goal of this approach is to make people feel safe and secure, connect people to health care and other resources, and reduce stress reactions. There are guides for carrying out the treatment, but experts do not know yet if it helps prevent or treat PTSD. In single-session psychological debrieing, another type of mass.