-- cyfrifiad i’w gynnal bob deng mlynedd ond gan dybio bydd y rhan fwyaf o bobl yn cwblhau’r ffurflen cyfrifiad ar-lein yn hytrach nag fel holiadur papur a dderbynnir drwy’r post (bydd dulliau ateb amgen ar gael i’r rhai sy’n methu cwblhau’r Cyfrifiad ar-lein):
--  a census to be carried out every ten years but assuming that most people will complete the census form online rather than as a paper questionnaire received through the post (alternative response mechanisms will be available for those unable to complete the Census online);