GOV.WALES uses cookies which are essential for the site to work. Non-essential cookies are also used to tailor and improve services. By continuing to use this site, you agree to our use of cookies.
Y duedd i'r sawl sy'n arfarnu prosiect fod yn rhy optimistaidd am agweddau ar y prosiect hwnnw, ee costau cyfalaf a chostau gweithredu, hyd y prosiect a'i fanteision.