The food isn't fancy, but it's certainly an 'improvement over' what we're served at school.
His cooking needs 'improvement'. = There's still 'room for improvement' in his cooking.
The editor made some 'improvements' to/in the article before it was printed.
(..) you to boarding school? No. That was a result of my work with lasers. - new neighbor? - Evidently. Significant improvement over the old neighbor. -pound transvestite with a skin condition? Yes,she is. - Oh,hi. - Hi. (..)2007 TvShow: The Big Bang Theory Title: Pilot Season: 1 Episode 1