While joint committees do not have to be politically balanced, the appointing authorities must ensure that the members they appoint reflect the balance of their own authority.
Er nad oes rhaid i gyd-bwyllgorau sicrhau cydbwysedd gwleidyddol, rhaid i’r awdurdodau penodi sicrhau bod yr aelodau a benodir ganddynt yn adlewyrchu cydbwysedd eu hawdurdod eu hunain.