D'Appolonia, D'Appolonia Consulting Engineers, Pittsburgh, Pennsylvania. ^ Biafore, Bonnie (December 14, 2011).^ 'Big Data, Small World: Kirk Borne at TEDxGeorgeMasonU'.House of Representatives, Ninety-seventh Congress, First Session, June 24, 25, 1981'. ^ 'NASA Program Management and Procurement Procedures and Practices: Hearings Before the Subcommittee on Space Science and Applications of the Committee on Science and Technology, U.S.A Leader's Guide to Knowledge Management: Drawing on the Past to Enhance Future Performance. ^ a b Girard, John Girard, JoAnn (June 1, 2009).Archived from the original on March 20, 2018. Myers, United States Department of Defense ()'. ^ a b ' News Transcript: DoD News Briefing – Secretary Rumsfeld and Gen.
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. 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 recognized but poorly understood phenomena. 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. This has led me classify unknowns into one of the following two types: 1. The risk posed by unknowns is somewhat dependent on the nature of the unknown relative to past experience. 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.