A number of surveys have influenced policy and delivery through providing data to plan interventions, set baselines, monitor progress, and support evaluations.
Mae nifer o arolygon wedi dylanwadu ar ddatblygu a chyflenwi polisïau drwy ddarparu data i gynllunio ymyriadau, pennu llinellau sylfaen, monitro cynnydd, a chefnogi gwerthusiadau.