Local authorities complete data collection forms with built in guidance and primary validation which allows them to validate some data before sending to the Welsh Government.
Mae awdurdodau lleol yn cwblhau ffurflenni casglu data sy'n cynnwys canllawiau a dulliau dilysu sylfaenol sy'n eu galluogi i ddilysu rhannau o'r data cyn eu hanfon at Lywodraeth Cymru.