Central guidance provided by NWSSP for entering information on the WNWRS provides assurance that data is inputted consistently across practices and health boards.
Mae canllawiau canolog a ddarparwyd gan NWSSP ar gofnodi gwybodaeth ar WNWRS yn rhoi sicrwydd bod data'n cael eu mewnbynnu mewn ffordd gyson gan bractisau a byrddau iechyd.