This chapter challenges the conventions of psychological debriefing as an intervention that is only applicable in the earliest period post disaster. As psychological debriefing has become more widely accepted, its original highly specific workplace focus has been broadened. The usual application of debriefing to the immediate post-disaster period may reflect its military and emergency services origins. The chapter proposes that it is useful to disentangle the underlying conceptual assumptions involved in psychological debriefing in order to inform an expanded use of the psychological principles that debriefing must be utilized to be effective. Psychological debriefing emphasizes supporting natural processes of recovery and removing barriers to resolution of the emotional impact of life-threatening events. Research on psychological debriefing procedures is often difficult to implement because of the intense and compelling level of need when one is responding to catastrophic situations.