In order to allow for changes in the profile of candidates and councillors to be tracked over time, the survey must be repeated at the time of each ordinary election (section 1 of the Measure).
Er mwyn olrhain y newidiadau ym mhroffil yr ymgeiswyr a’r cynghorwyr dros amser, mae’n rhaid ailadrodd yr arolwg adeg pob etholiad arferol (adran 1 o’r Mesur).