The phrase "highest tier of" is correct and commonly used in written English.
It is typically used to refer to the top level or category within a ranking or hierarchy. Example: "She was promoted to the highest tier of management within the company, making her one of the most influential decision-makers."
The testing strategy has to be driven by a coherent research risk hypothesis and strategy from the lowest to the highest tier of testing - a 'red thread' connecting the tiered testing programme is essential.
To qualify for Cooper Union's largess, applicants had to prove themselves on the highest tier of the highest tier of academic or artistic achievement.
It was only accessible to the highest tier of customers in the past".
"The highest tier of buyers is really looking to create these mini-megamansions in the sky".
So it's perhaps unsurprising to find that gradually, the highest tier of privacy settings have been removed by Facebook.
The two teams have met each other in the highest tier of English league football every season since 1975/1976.
Changing the gender balance at the highest tiers of Hollywood seems to me like an intimidating, time-consuming process, but Davis takes a straightforward approach.
Patrick Maly, Fortune's co-worker, pointed out the police officers roaming the highest tiers of Yankee Stadium, something he never noticed in previous regular-season games.
Despite the many barriers in place that only let a tiny minority reach the highest tiers of fame, "it's part of the way the system works that everybody needs to think that they can be a YouTube star in order to keep going back and watching, and liking, and contributing content to the platform that continuously needs new content".
In sub-Saharan Africa, even the highest tiers of health care hospitals—have significant energy insecurity.
These findings reflect the significant energy insecurity not only at the primary care level but also in hospitals the highest tiers of health care provision.
