The external work, undertaken by the Institute for Fiscal Studies, has focused on analysing the impact of the welfare reforms on labour supply in Wales.
Mae'r gwaith allanol, a wnaed gan y Sefydliad Astudiaethau Cyllid, wedi canolbwyntio ar ddadansoddi effaith y diwygiadau lles ar y cyflenwad llafur yng Nghymru.