Arweiniodd Dr Jo Mower, Is-lywydd Coleg Brenhinol Meddygaeth Frys Cymru a Chyfarwyddwr Clinigol y Rhaglen Genedlaethol ar gyfer Gofal Heb ei Drefnu, dîm o staff y rheng flaen a ddatblygodd y mesurau newydd, ar ôl iddynt ofyn am farn staff a chleifion.
Dr Jo Mower, vice president of the Royal College of Emergency Medicine (RCEM) Wales and Clinical Director for the National Programme for Unscheduled Care, led a team of front-line staff who developed the new measures, following engagement with staff and patients.