"proven know-how" is correct and usable in written English.
You can use it to refer to knowledge and skills that have been tested and are now reliable and trusted. For example, "The team has decades of proven know-how in the field, making them the best choice for the project."
Chief executive Jim McCarthy said: "Poundland will improve choice, value and service for 99p Stores' customers, bringing Poundland's proven know-how and range to 99p Stores".
In this perspective, M&A in comparison to internal growth offers the advantage to the firm of providing a quick access to new technologies using proven know-how, rather than to set up 'ex-novo' new activities (greenfield) or do own R&D.
"I've proven I know how to create jobs and opportunities for them," he said.
Mr. Scheib has already proven he knows how to please his clients.
Your sales and marketing engine is firing on all cylinders and you have proven you know how to engage customers and keep them renewing.
Today, Facebook is lending them a hand: it's launching a new directory featuring well established consultants who have proven they know how to leverage Facebook's platforms.
So I wondered to myself: If I can decipher the cause maybe I can figure out not only how to rejuvenate organizations, which I have proven I know how to do, but to retard the aging of people too.
She should learn from Trump, who, no matter what happens in Iowa, has proven he knows how to appeal to voters, whether he can get them out to vote for him or not.
She and husband Vince built World Wrestling Entertainment into a billion dollar global enterprise, proving she can grow things, and to prove she knows how to enjoy her money, there is the McMahon's 47-foot yacht, Sexy Bitch.
Kyrgyzstan, with 94percentt of its land covered by mountains, the highest in Central Asia, seemed like the place to risk it all, especially since unlike, say, Switzerland or Colorado, I wouldn't have to sign any release papers or show a certificate proving I knew how to ride a horse.
After the American television-viewing audience expressed its dismay over stale and boring formal debates, we here at Fox jumped at the chance to winnow the field down in the exciting format of a reality show, where our contestants get to prove they know how "to president" by performing various wacky tasks for our collective amusement.
