The phrase "a strategy that has worked" is correct and usable in written English.
You can use it when discussing a plan or approach that has proven to be effective in achieving a desired outcome.
Example: "After analyzing our previous campaigns, we decided to implement a strategy that has worked well in the past to boost our sales."
Alternatives: "an effective strategy" or "a successful approach".
It is a strategy that has worked well.
Mr. Ritter is following a strategy that has worked for others.
Rangers Coach Tom Renney started using them that way against Crosby last season, a strategy that has worked well.
One possibility would be to make it a tax haven, a strategy that has worked for Monaco, Andorra and Liechtenstein, he said.
But it's a strategy that has worked for other countries, such as Bangladesh, and Haitians in the slums would tell you that their most fervent wish is for jobs.
That has left China with little choice but to garner influence through a strategy that has worked well in Africa and Latin America: investing and joining with local companies and financing good works to earn good will.
Before releasing her, they threatened to upload video of the attack onto the Internet if she reported the crime, a strategy that had worked with previous victims.
It was a strategy that had worked handsomely on a recent jaunt to Cape Town with Virgin Atlantic, whose kind staff waived a heftier £40 charge by moving me to the bulkhead.
So the Irish, with few players who could match the Orangemen physically, tucked their defense into a zone and dared Syracuse to beat them from the outside, a strategy that had worked earlier this season in upsets of Ohio State and Connecticut.
The plan was part of an effort to bring more attention to the AAFC and help attendance by sending its most successful team on a cross-country road trip, a strategy that had worked in baseball.
And it's a strategy that, having worked there, is now being applied across the board.
