Project 4 involves evaluating how questions about Welsh language ability have been developed and delivered on both the APS and the census.
Mae'n fodd i ddadansoddi pedair gwlad y DU a'u cymharu mewn perthynas â'r heriau a wynebir gan gyflogwyr o ran sgiliau a'r lefel o hyfforddiant a gynigir ganddynt.