It has proved controversial with criticisms that it is overly generous to the private contractors.
It has proved a much more serious affair than was thought likely at its outset.
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Now that it has dissipated into a network, it has proved far less effective.
But where pricing has been introduced, as in Scandinavia, it has proved effective and popular.
Our interest here, stock picking, may be less lofty, but it has proved worthwhile.
But it has proved unpopular with dentists, with about one in ten refusing to sign it.
Perhaps unsurprisingly, it has proved impossible for Enel and the municipalities to agree on prices.
Yet it has proved utterly incapable of protecting the tea estates or the people who work on them.
In the three years and three months since Vonage began offering service, it has proved widely popular--and wildly unprofitable.
It has proved deadly in more than half of the confirmed cases so far, the World Health Organization said.
"We've done this at a number of schools over the years and it has proved quite effective, " he said.
It has proved much more difficult for borrowers to switch their debt to another card for a better deal.
While it has proved a hit with pupils, the scheme has come as a relief to the school's teachers.
And so it has proved - with the Bundesbank signalling its opposition to a banking union of this sort.
It has proved a headache for policymakers who have tried to weaken it.
It has proved deadly in more than half of the confirmed cases so far, according to the World Health Organization.
So it has proved with veterans of the long, debilitating feud between Mr Brown and Mr Blair and their acolytes.
It has proved very fruitful and led to a large variety of projects of which this volume presents a selection.
It has proved itself on models of human tissue, though, and is about to be tested on the real thing.
But it has proved much less able to deal effectively with more pressing threats to state security, such as organised crime.
For home riders it has proved a difficult Giro, with last year's winner Michele Scarponi in fourth and Ivan Basso fifth.
Yielding is another concept Ms. Bravo's tai chi master, Sat Hon, taught her, and it has proved helpful in negotiating the city.
For a network that is duel revenue streamed--we get revenue from our cable affiliates and advertisers--it has proved a very smart model.
Second, because nobody controls the internet, it has proved hard to censor.
"It has proved fundamental in providing vital communications and in recent months has been significantly repaired and rejuvenated, " said an Army spokesperson.
Some 300, 000 people have been resettled so far, many in the southern Oromia region, where it has proved particularly hard to subsist.
Yet it has proved a perennial source of acrimony, and not just because so much of it is misspent (see article).
It has yet to have a serious discussion on immigration, and it has proved incapable of bringing down its massive public debt.
Many companies have tried and failed to break the US market, but it has proved a hard nut to crack for UK retailers.
But Lampetra's unique propulsion system could also have useful applications, as it has proved an efficient way to move a machine through water.
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