These methods have proved to be very effective in policy design.

But this method did not prove exact in all cases.

"This method has proved a successful way of getting people to pay rent," she said.

These methods have proven quite successful for the tobacco industry.

This method of treatment has proven to be the most effective.

We cannot give you high rank in the beginning, until your method proves itself clearly.

The methods had proved themselves in action since, over the course of many campaigns.

Other methods like observation have not proven to be as useful.

But those methods proved to be ways Enron could increase its revenue with little additional work.

Each year, the method proves less capable of taking the Union forward.