He said it was possible the two groups were acting together.

Perhaps both groups are therefore acting in exactly the same way.

The third group, who took the tests without being told of any competition, acted as a control.

In practice, however, several political groups act as de facto parties.

The group acted as the radio station house band, playing country music live on air.

When it began there was no Government army as such, only a range of armed groups acting on their own.

The group around the person acts as a mirror for them and shows a reflection of how they should view themselves.

We need to act the way other successful groups in this country have acted for centuries.

A group of young people without Saturday jobs, will act as a control group.

But more often than not, peer groups act as cement shoes, the study suggested.