There is a related problem of segregation in the formal labour market, with women clustered in "pink collar", largely service sector, jobs with inferior working conditions, less job security and lower pay. In high-income countries, more than 85 per cent of employed women work in the service sector, primarily in education and health. In order to address wage gaps resulting from occupational segregation, the Convention on the Elimination of All Forms of Discrimination against Women and ILO Conventions require equal pay for equal work or for work of equal value, comparable in skill, responsibility, effort and working conditions. The ILO guide to gender-neutral job evaluation provides an objective evaluation system. The ILO also recommends that policies to combat occupational segregation also encourage men to enter occupations traditionally associated with women.