 In criticism, advocates of proportional and group representation have argued that single member district representation tends to muffle the voices and ignore the interests of minority groups in the society (Mill 1861; Christiano 1996). Minority interests and views tend to be articulated in background negotiations and in ways that muffle their distinctiveness. Furthermore, representatives of minority interests and views often have a difficult time getting elected at all in single member district systems so it has been charged that minority views and interests are often systematically underrepresented. Sometimes these problems are dealt with by redrawing the boundaries of districts in a way that ensures greater minority representation. The efforts are invariably quite controversial since there is considerable disagreement about the criteria for apportionment.