What teetered in the balance that week was not only the whole fabric of Russian-American relations since the cold war, but the principle of democratic control over Russia's army.

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South Africa has recently approved in principle the use of culling to control populations.

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They can be made in various ways, but they all work on a common principle: a kind of crowd-control for electrons.

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This cardinal principle of state policy is embedded in the strict export-control regime regarding sensitive technologies.

ECONOMIST: Vouchsafe?

We also believe that giving people control over what they share is a fundamental principle of this rewiring.

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In the 1950s, when I was born, the organizing principle known as "command-and-control" was shot through every aspect of American life.

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But it has by now established the principle that the only way to control health-care costs is for this panel of medical high priests to dictate limits on certain kinds of care to certain classes of patients.

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It reflects a fundamental principle of risk perception: that people are far more fearful of things they don't control than things they do.

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It seems a sound principle, and incompetence was hardly unknown in the traditional, command-and-control model of public services.

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But now that the principle of hypothecation has been accepted, it may be difficult for it to resist further encroachments into its control of the public finances.

ECONOMIST: Taxation