Data are collated into an electronic return and submitted to the Welsh Government through DEWi, a secure online data transfer system developed by the Welsh Government.
Caiff data ei gasglu gan awdurdodau lleol i ffurflen electronig a'i chyflwyno i Lywodraeth Cymru drwy DEWi, system drosglwyddo data ar-lein ddiogel a ddatblygwyd gan Lywodraeth Cymru.