For mobile devices or certain classes of SaaS applications, perhaps it will be sufficient to set some ground rules, observe activity, and test when possible that the rules are being followed.

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With the instruments currently monitoring Santorini, "we now have sufficient on-the-ground instrumentation to measure ongoing activity, " Newman said.

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Without a sufficient number of forces on the ground, the US would lose its ability to gather intelligence and so know what targets to attack.

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But even if America and Russia succeed in convening a peace conference, it is far from clear that the Syrians around the table will wield sufficient influence over the forces fighting on the ground.

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Directed energy weapons such as lasers and particle beams, (either ground-based or space-based, having sufficient power to damage satellites or their sensors).

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Economists said Berlusconi commanded neither sufficient political authority to push through spending cuts nor the moral high ground to squeeze more taxes out of Italians while he faced trial on various charges.

CNN: February 22, 2013 -- Updated 1131 GMT (1931 HKT)

"Teaching is not of sufficient quality, or improving with enough urgency, to enable students to make up the ground they need, " the report said.

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An instructor on the ground said he saw Miss Preston attempt to correct this by moving her weight, but it was not sufficient, the report said.

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