As a general rule these considerations should be made at the earliest point possible in the competitive tendering procedure but must be made (or confirmed) on assessment of tenders.
Fel rheol gyffredinol, dylid ystyried y rhain ar y cyfle cynharaf posibl yn ystod y weithdrefn dendro gystadleuol ond mae’n rhaid iddynt gael eu hystyried (neu eu cadarnhau) ar adeg asesu tendrau.