Table 1: Disaster Levels
Level	Downtime	Typical Causes	Business Location Available?	Number of People Affected	Business Impact
One	4 hours or less	Single workstation failure	Yes	Three or fewer	Low
Two	24 hours or less	Server failure, WAN disruption	Yes	Four or more	Low
Three	72 hours or less	Water leak, extended power failure	No	10 or more	Moderate
Four	More than 72 hours	Earthquake, flood, terrorist attack, war	No	10 or more	High