This will include engaging in research work, contacting individuals, using the information that the agency holds and possibly gathering more information to enable a person to be traced.
Bydd hyn yn cynnwys cymryd rhan mewn gwaith ymchwil, cysylltu ag unigolion, defnyddio'r wybodaeth sydd gan yr asiantaeth ac, o bosibl, casglu rhagor o wybodaeth i alluogi olrhain person.