Professor Chapman said the web had made information accessible to millions around the world, but it was very difficult to institute a system of quality of control.
As far as targeting parents goes, it is all very well to try to target the parents of young children to try to get them to do things in different ways, but it is very difficult satisfactorily to punish parents who won't keep control of their children.
Derbyshire Fire and Rescue said it had been a difficult fire to put out completely but it is under control.
But the Philippines in particular faces a difficult few months trying to control the inflation that might follow devaluation without raising interest rates so high that they choke off growth.
The claims are difficult to verify but it is known that anti-Gaddafi forces control Benghazi, Libya's second city, while the long-time leader still controls most of the capital, Tripoli, home to two million of the country's 6.5 million population.
But today's problem of non-point source pollution is more difficult to control.
Efforts to stay ahead of the gangs are difficult but they are being kept under control, the IWF said.
But as the Digg revolt shows, damage control can be difficult even when Web sites respond to legal threats.
It is still not known why the control mechanism breaks down in some people, but the results are very difficult to treat.
He also told Reuters that most of the weapons evidence has been found but that any further search would be much more difficult after control of the country is returned to Iraqis.
Polio is extremely difficult to control, because a large majority of infected people show no symptoms, but they can still spread the virus.
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.
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