Diben y ddyletswydd yw sicrhau bod cyrff cyhoeddus penodol, wrth wneud penderfyniadau strategol fel penderfynu ar flaenoriaethau a phennu amcanion, yn ystyried (cynnal asesiad) sut y gallai eu penderfyniadau helpu i leihau anghydraddoldebau sy'n gysylltiedig ag anfantais economaidd-gymdeithasol.
The purpose of the duty is to ensure specified public bodies, when making strategic decisions, such as deciding priorities and setting objectives, consider (undertake an assessment) how their decisions might help to reduce the inequalities associated with socio-economic disadvantage.