Make sure your strategy has proved itself over many years and in different situations.

Such a strategy has proved reliable over the last 30 years.

In the short term this strategy soon proved to have been a mistake.

They've been trying to do both, and so far the strategy has proven to be a success.

For the first fifteen years of the war, this strategy proved largely successful.

But there were many signs today that this strategy might not prove possible.

Denmark's strategy proved the more beneficial in the short run.

To a certain extent our strategy proved to be right.

Our new strategy may prove a very good response to that.

Two strategies have proved particularly effective for the market leaders.