Environmental surveys began in April 2008 which will continue until the autumn.

After a week of checking everything out the survey began in earnest on 9 February.

The survey began when only a few hundred hosts were Internet linked.

The survey began in 1975 and only focused on that year's senior class.

This survey begins by examining our country's education system, for two reasons.

An intense survey began of the roughly 50 large buildings on the complex.

The survey began in 2004; results may begin to come in later this year.

The survey had scarcely begun when the Republicans came to town.

In January 2001, when the survey first began, it identified only 308 malicious programs.

Its average value since 1947, when the survey began, is 85.