To make the survey as short as possible and reduce respondent burden, questions were routed where possible to allow respondents to automatically miss pages that were not relevant to them.
Er mwyn gwneud yr arolwg mor fyr â phosibl a lleihau’r baich ar ymatebwyr, cafodd cwestiynau eu cyfeirio, lle bo modd, er mwyn i ymatebwyr neidio tudalennau a oedd yn amherthnasol iddynt yn awtomatig.