"sufficient improvement" is a correct and usable phrase in written English.
You can use it to refer to an improvement that is significant enough to provide satisfaction. For example, "I'm happy to see that there has been a sufficient improvement in my test scores since last semester."
But would the other 9,998 hours result in a sufficient improvement?
The downside is that 99 homes, or more than one in four, failed to make sufficient improvement to be upgraded.
Researchers studied 100 people with O.C.D. who were taking antidepressants without sufficient improvement.
During Routh's stay at the Dallas V.A., Raymond and Jodi failed to notice much progress, but his doctors eventually cited sufficient improvement to release him.
In the process of choosing schools whose administrators deserved bonuses, Mr. Levy discovered that 9 or 10 of the schools that had shown sufficient improvement to meet the program's criteria were still among the city's worst, officials said, and he immediately barred those principals from receiving rewards.
Therefore, it is hard to expect sufficient improvement in detection performance.
"Today's results show that, despite significant funding growth, we are not getting sufficient improvements in student outcomes," Birmingham said.
The Home Office has overturned a ban on London Metropolitan University admitting students from outside the European Union after agreeing it has made sufficient improvements to its monitoring systems.
In response to Mr. Nickles's motion, Children's Rights filed its own motion asking that the city be held in contempt for failing to make sufficient improvements.
He was referring to the ability of landlords to deregulate apartments that become vacant by making sufficient improvements to the apartment to get the rent above $2,000.
Many voters complained there had not been sufficient improvements to the economy, more than a decade after a Nato-led bombing campaign forced the retreat of Serbian troops to end the Kosovo war.
