Definitions Edit

Uncertainty is

[the] degree to which a calculated, estimated, or observed value may deviate from the true value.[1]
[a] condition, event, outcome, or circumstance of which the extent, value, or consequence is not predictable.[2]
the state, even partial, of deficiency of information related to, understanding or knowledge of an event, its consequence, or likelihood.[3]
The inability to know in advance the exact likelihood or impact of future events.[4]
[t]he state of being not known, indeterminate, questionable, variable.[5]

Overview Edit

Uncertainty may stem from many causes, including the lack of information. The concept of uncertainty is useful in understanding that likelihoods and consequences can oftentimes not be predicted with a high degree of precision or accuracy.[6]

References Edit

  1. DHS Risk Lexicon, at 38.
  2. Glossary of Defense Acquisition Acronyms and Terms (July 2011) (full-text).
  3. ISO/IEC 31000:2009, at §2.1.
  4. Playbook: Enterprise Risk Management for the U.S. Federal Government, at 103.
  5. ICS-CERT, Common Cyber Security Language (full-text).
  6. DHS Risk Lexicon, at 38.