The PAPI program is based on the CISM (Critical Incident Stress Management) methodology, approved by the United Nations, which has been developed by the International Critical Incident Stress Foundation (ICISF) to support rescue teams after critical incidents.
The characteristics of a critical incident are revealed when the life and/or physical safety of a crew member or someone close to them is, or appears to be, threatened. The individual's perception of the incident is more significant than its actual outcome. A critical incident usually occurs unexpectedly and often confronts the affected person with feelings of helplessness.
The program supports healthy individuals who exhibit normal responses to an abnormal incident. Since these individuals are healthy, no diagnosis of illness is required, but it may be advisable for them to take a short break before their next flight to allow their reactions to a stressful situation that is affecting them to dissipate.
Most common experiences that trigger the CISM methodology:

CISM teams, or Pilot Support Programs, are established worldwide, forming an extensive international network. At the national level, these teams may be known by other names, such as the CISM teams of other airlines and/or their unions: Stifftung Mayday, PAN, Pilots 4 Pilots, etc.