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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