When this good work is done, four - way meetings become a very powerful force for change and can move the parties towards mutual understanding and, eventually, to an agreement. (divorcesource.com)
Perhaps not; and perhaps political efforts to generate commitments to ambitious if remote targets can be worthwhile as powerful forces for change, as with human rights in eastern Europe. (ft.com)
Parents are powerful forces for change in schools. (edutopia.org)