Third party research agencies are commissioned to conduct annual data collections, and the database is provided to the current contractor in order to contact visitor attractions to collect data.
Caiff asiantaethau ymchwil trydydd parti eu comisiynu i gynnal casgliadau data yn flynyddol a darperir y gronfa ddata i'r contractiwr cyfredol er mwyn cysylltu ag atyniadau ymwelwyr i gasglu data.