"continuing improvement" is correct and usable in written English.
It can be used to indicate ongoing progress with any goal or task. For example, "Our company is committed to continuing improvement in product quality."
"With the continuing improvement in consumer spending, and improving profitability of these businesses, we're beginning to see a significant influx of small-business buyers to Chevrolet showrooms," said Don Johnson, vice president of U.S. sales operations at GM.
Of their continuing improvement, Wenger said: "Our young players have improved and we have more confidence this season as well".
Dr. High said that, while researchers expected visual improvement to plateau after about eight weeks, "many people report continuing improvement," suggesting their brains might be continually adjusting to the new visual pathways.
TBL improves knowledge scores in undergraduate neurology education, with sustained and continuing improvement up to 48 hours later.
Economists forecast continuing improvement in the labor market.
"The continuing improvement of England's beaches and bathing water are a terrific success story.
Operation Impact, which floods troubled areas with police, has been credited with the continuing improvement.
The legislation needs to be passed to establish a structure to force continuing improvement over the years.
Programmers around the world have contributed thousands of hours of their time to the continuing improvement of Linux.
As its annual accounts show, there has been a continuing improvement in Post Office's financial performance, and a reduced reliance on taxpayer support.
Unable to tolerate the prospect that the cycles of conflict will continue, many are anxious to find continuing improvement in the human lot.
