There are known knowns
"There are known knowns" is a phrase from a response United States Secretary of Defense Donald Rumsfeld gave to a question at a U.S. Department of Defense (DoD) news briefing on February 12, 2002 about the lack of evidence linking the government of Iraq with the supply of weapons of mass destruction to terrorist groups.
Reports that say that something hasn't happened are always interesting to me, because as we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns – the ones we don't know we don't know. And if one looks throughout the history of our country and other free countries, it is the latter category that tend to be the difficult ones.
The statement became the subject of much commentary.
Rumsfeld is often given credit for the phrase, but the idea of unknown unknowns was actually commonly used inside NASA from much earlier. Rumsfeld himself cites NASA administrator William Graham in his memoir. Kirk Borne, an astrophysicist who was employed as a data scientist at NASA Goddard Space Flight Center at the time, notes that he used the phrase "unknown unknowns" in a talk to personnel at the Homeland Security Transition Planning Office a few days prior to Rumsfeld's remarks, and speculates that the term may have percolated up to Rumsfeld and other high-ranking officials in the defense department.
The term was used in evidence given to the British Columbia Royal Commission of Inquiry into Uranium Mining in 1979:
Site conditions always pose unknowns, or uncertainties, which may become known during construction or operation to the detriment of the facility and possibly lead to damage of the environment or endanger public health and safety. The risk posed by unknowns is somewhat dependent on the nature of the unknown relative to past experience. This has led me classify unknowns into one of the following two types: 1. known unknowns (expected or foreseeable conditions), which can be reasonably anticipated but not quantified based on past experience as exemplified by case histories (in Appendix A and 2). Unknown unknowns (unexpected or unforeseeable conditions), which pose a potentially greater risk simply because they cannot be anticipated based on past experience or investigation.
Known unknowns result from phenomena which are recognized, but poorly understood. On the other hand, unknown unknowns are phenomena which cannot be expected because there has been no prior experience or theoretical basis for expecting the phenomena.
As for the substance of his statement, Rumsfeld's defenders have included Canadian columnist Mark Steyn, who called it "in fact a brilliant distillation of quite a complex matter", and Australian economist and blogger John Quiggin, who wrote, "Although the language may be tortured, the basic point is both valid and important ... Having defended Rumsfeld, I'd point out that the considerations he refers to provide the case for being very cautious in going to war."
Psychoanalytic philosopher Slavoj Žižek says that beyond these three categories there is a fourth, the unknown known, that which we intentionally refuse to acknowledge that we know: "If Rumsfeld thinks that the main dangers in the confrontation with Iraq were the 'unknown unknowns', that is, the threats from Saddam whose nature we cannot even suspect, then the Abu Ghraib scandal shows that the main dangers lie in the "unknown knowns"—the disavowed beliefs, suppositions and obscene practices we pretend not to know about, even though they form the background of our public values."
German sociologists Daase and Kessler (2007) agree with a basic point of Rumsfeld in stating that the cognitive frame for political practice may be determined by the relationship between what we know, what we do not know, what we cannot know, but Rumsfeld left out what we do not like to know.
- Epistemic modal logic
- Dunning–Kruger effect
- I know that I know nothing
- Ignoramus et ignorabimus
- Ignotum per ignotius
- Johari window
- List of political catch phrases
- Ludic fallacy
- Outside Context Problem
- "Defense.gov News Transcript: DoD News Briefing – Secretary Rumsfeld and Gen. Myers, United States Department of Defense (defense.gov)".
- Girard, John; Girard, JoAnn (2009-06-01). A Leader's Guide to Knowledge Management: Drawing on the Past to Enhance Future Performance. Business Expert Press. pp. 55–. ISBN 9781606490198. Retrieved 10 February 2014.
- Known and Unknown: A Memoir
- "Big Data, Small World: Kirk Borne at TEDxGeorgeMasonU". Retrieved 14 September 2015.
- Statement of Evidence of E. D'Appolonia, D'Appolonia Consulting Engineers, Pittsburgh, Pennsylvania. Proceedings of the British Columbia Royal Commission of Inquiry into Uranium Mining, Phase V: Waste Disposal, ISBN 0-7718-8198-3
- Newhouse, J. (1982), 'A reporter at large: a sporty game; 1-betting the company', The New Yorker, 14 June, 48-105.
- Steyn, Mark (December 9, 2003). "Rummy speaks the truth, not gobbledygook". Daily Telegraph. Retrieved 2008-10-30.
- Quiggin, John (February 10, 2004). "In Defense of Rumsfeld".
- "What Rumsfeld Doesn't Know That He Knows About Abu Ghraib". Retrieved 2009-02-23.
- Knowns and Unknowns in the `War on Terror': Uncertainty and the Political Construction of Danger, Christopher Daase and Oliver Kessler, Security Dialogue, December 2007; vol. 38, 4: pp. 411–434.
- Neve, Geert de; Luetchford, Peter (2008). Hidden Hands in the Market: Ethnographies of Fair Trade, Ethical Consumption, and Corporate Social Responsibility. Emerald Group Publishing. pp. 252–. ISBN 9781848550582. Retrieved 10 February 2014.
- Scott (2014). "Not Giving an Inch in a Battle of Wits and Words; Deciphering Donald H. Rumsfeld in ‘The Unknown Known’". Retrieved 4 April 2014.
- February 12, 2002, Press conference – The reporter asks the question that leads to the "known unknowns" response at approx. 37:19
- DoD News Briefing – Secretary Rumsfeld and Gen. Myer, February 12, 2002 11:30 AM EDT Transcript of the briefing