Whether much improvement ever occurred is a matter of debate.

But, since then, much improvement has occurred in this area.

Improvement in language ability occurred, despite the lack of professional treatment.

And nothing suggests that any improvement will occur in 1992.

Since then, the area has changed hands many times, though no substantive improvements have occurred.

Crime is down across the country, but Atlanta's improvement has occurred at more than twice the national rate.

If improvement still did not occur, the state could then dissolve the board.

More often, improvement occurs gradually over a period of weeks or months.

If improvements do not occur health care policies need changing.

Moreover, the improvement occurs within two years of starting treatment.