Cities seeking voluntary methods of desegregating schools developed Montessori magnet schools, first in Cincinnati, and then in other urban systems, most notably Milwaukee and Kansas City. (public-montessori.org)
We must have population control at home, hopefully through a system of incentives and penalties, but by compulsion if voluntary methods fail. (drtimball.com)
The end is still nigh, he asserted, and he stood unflinchingly by his 1960s insistence that population control was required, preferably through voluntary methods. (dotearth.blogs.nytimes.com)