There's been a definite improvement in your English since you arrived.
Billy's work at school has shown signs of improvement this year.
Local parents successfully campaigned for safety improvements at the playground.
The report suggests that there has only been a marginal improvement in women's pay over the past few years.
The improvement in sales figures had a beneficial effect on the company as a whole.
Demonstration of these improvements is planned for the near future.
Models by definition are simply representations and are liable to change and constant improvement.
We incline to think that the latter change, in contrast to the former, represents a cognitive improvement in our condition.
