The agency is now trying to determine how close the voluntary system is to meeting the goal.

"If you're designing a voluntary system, it's hard to do it any other way."

The approved way lies in a voluntary system of labeling.

Is it just naive to hope that a voluntary system will work?

Teachers are paid on a voluntary system, with students offering whatever they like at the end of the course.

Maybe we could work out some kind of voluntary system.

It provides for a voluntary system in which Americans would purchase private health insurance.

Legislation, if necessary, to move beyond the current voluntary system of occupational pensions.

I support his view that maintenance of the existing voluntary system is the right solution.

The model being proposed here with a voluntary system for European companies is perhaps the most practical.