When a trial involves thousands of cable customers, they say, that is open competition.

Such trials can take years and involve thousands of patients.

The project involved thousands of writers from across the Soviet Union.

The experiment involved thousands of people in Turin and cost £ million.

Later, these cooperatives were put together to involve thousands of people.

But that investigation involved thousands of men giving blood.

That's because putting a car together involves thousands of individual tasks.

It has involved thousands of students at two dozen Brooklyn schools.

It involves thousands of volunteers at over 120 crisis centers nationwide.

The strikes, which sometimes involve thousands of workers, often include demands for higher pay, insurance and better working conditions.