An Introduction To
Information, Network and Internet Security
Ten by Ten
|
Description |
Interpretation |
|
Negligible |
Once every 1000 years or less |
|
Extremely unlikely |
Once every 200 years |
|
Very unlikely |
Once every 50 years |
|
Unlikely |
Once every 20 years |
|
Feasible |
Once every 5 years |
|
Probable |
Annually |
|
Very probable |
Quarterly |
|
Expected |
Monthly |
|
Confidently expected |
Weekly |
|
Certain |
Daily |
(Very approximately each one is four times more likely than the previous one, which covers the range "once in 1000 years" to "daily" in a range of 1 - 10)
The Security Practitioner
An Introduction to Information Security
