In Stage One (the pre-assessment process, which is limited to two months) all prescribed checks, including criminal record and health checks, are conducted.
Yn ystod Cam Un (y broses cyn asesu, a gaiff ei chyfyngu i ddeufis), cynhelir yr holl wiriadau rhagnodedig, gan gynnwys gwiriadau cofnodion troseddol a gwiriadau iechyd.