In doing so they have a responsibility to assure the quality of the regulated services they commission and to performance manage them effectively and proportionately.
Wrth wneud hynny, maen nhw'n gyfrifol am sicrhau ansawdd y gwasanaethau rheoleiddiedig y maen nhw'n eu comisiynu, yn ogystal â rheoli eu perfformiad yn effeithiol ac yn gymesur.