"Organizational accidents typically have multiple contributing causes, involve people at numerous levels within the organization, and are characterized by a pervasive lack of proactive measures to ensure adoption and compliance with a safety culture. They are generally catastrophic in nature and require complex organizational changes. All these aspects are present in this accident."
-- September 3, 2011 San Bruno Pipeline Blast: NTSB lays out another system failure http://disaster-wise.blogspot.
com/2011/09/san-bruno- pipeline-blast-ntsb-lays-out. html