1.   But a study of the longest-running experiment in Milwaukee suggests that vouchers can improve the prospects of the poorest and least prepared students.

2.   Introducing more competition into the educational system through programs like vouchers would improve educational quality and the skill level within the American work force, they said.

3.   Some earnestly believe that vouchers would improve public schools.

4.   Whether vouchers actually improve academic achievement for poor children of color remains an open question.