The phrase "a cornerstone strategy" is correct and usable in written English.
It can be used to describe a fundamental or essential approach in a plan or framework.
Example: "Implementing sustainable practices is a cornerstone strategy for our company's long-term success."
Alternatives: "a fundamental approach" or "a key strategy".
Our policy reports discuss solutions to achieve a broad and cost-effective deployment of renewable energy as a cornerstone strategy for meeting climate goals.
But it is American itself that has rallied around a "cornerstone" strategy of bulking up in New York, Los Angeles and Miami and at Chicago's O'Hare airport and the Dallas/Fort Worth airport.
Search engine optimization (SEO) is a cornerstone strategy to get a website noticed online.
Prevention of mother-to-child transmission (PMTCT) is a cornerstone strategy in reducing infant mortality from the human immunodeficiency virus (HIV).
The strong association between DM and excess body weight emphasizes the importance of weight control interventions at a population level as a cornerstone strategy to curb the "diabesity" epidemic [ 51].
USAA has a few equity standouts: USAA Cornerstone Strategy, a stock- oriented asset allocation fund with extremely low volatility, and two top-performing global funds — USAA International and USAA Emerging Markets.
For three decades, the ABM Treaty has been a cornerstone of strategy between the world's two biggest nuclear powers.
Feeding America's cornerstone strategy is to actively engage and seek collaboration from a wide range of partners in the public-private sector, including corporations, academia, and healthcare.
After studying the results, O'Shaughnessy came up with his own formula called the "United Cornerstone" strategy.
"The government has positioned renewable energy as one of its cornerstone strategies – with a clear path to encourage domestic manufacturing of renewable energy equipment," he adds.
The AT&T project was a cornerstone of that strategy.
