Uncertainty quantification, or "UQ, " is the quantitative characterization and reduction of uncertainty in computer applications through running very large suites of calculations to characterize the effects of minor differences in the systems.

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But as they try to deal with one problem for example, debt reduction for Greece it creates the risk of uncertainty for sovereign debt for Italy and Spain.

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In fact, I think -- our view of this is that while the agreement, the compromise did not achieve the kind of super-sized deficit reduction that we sought, it did end the uncertainty around the perception, the possibility that the United States might default on its obligations for its first time.

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"The economic uncertainty is because of SEC overreach, " Bush said during a meeting called to discuss tax reduction legislation in 2002.

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It also said "great uncertainty" remained over the planned transition at the end of the year from Cert (Carbon Emission Reduction Target) to the UK government's "Green Deal" - a scheme which aims to improve the energy efficiency of homes by eliminating the need for householders to pay upfront for efficiency measures.

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