Communication		Transmission failure or document loss
Contract		Party fails to honor or perform
Dangerous work		Serious accident disrupts progress
Exchange rates 		Dramatic change in rate
Labor competence		Unskilled productivity loss 
Delivery of goods		Specific component delivered late
Management		Change to a disinterested sponsor
Natural hazards		Severe fire, flood, earthquake incident
People resources		Specific skill suddenly not available
Project financing		Financial failure of funding source
Resources		Damage due to power failure
Schedule or Budget		Serious overrun discovered too late
Social environment		Politically motivated disruption
Technology		Chosen solution fails to work
Regulatory		Unexpected change in regulations	
Weather		Unusually heavy rain, snow or frost
And so on
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