In MENA, wherein surveillance is rather limited and difficult to implement, using existing data to make inferences about future size of HIV epidemics is a potentially efficient strategy.
"These have always been the most difficult to implement, rather than 'horizontal' measures that affect most of the population, because members of parliament begin to fear strong reactions in their constituencies and governments decide the political cost is too high," Malkoutzis said.
Groupware is efficient but rather inflexible, multi-agent systems are more flexible but difficult to implement.
Yet it remains politically difficult to implement.
Nor should it be difficult to implement.
Yet reform proved difficult to implement.
"Video replay is too difficult to implement.
"It is very difficult to implement".
But it will be extraordinarily difficult to implement.
"The governors said this would be extraordinarily difficult to implement.
Bertarelli's proposals could be difficult to implement.
