THE school voucher movement in the United States has been divided over its goals and strategies ever since Milton Friedman first urged a voucher plan in 1956. Two recent provoucher books document and continue these arguments, and taken together are likely to influence the school-choice debate for years to come. The School Choice Wars, † authored by John M. Merrifield, a professor of economics at the University of Texas-San Antonio, is a free-market argument for vouchers accompanied by a withering critique of the school-choice movement. Schools, Vouchers, and the American Public, †† by Terry M. Moe, professor of political science at Stanford, offers a political analysis of vouchers. These two books, which were written independently of each other, help to clarify many of the major issues dividing the voucher movement.