Senior Principal Research Officers (Grade 6) oversee multiple research teams within a policy area and are responsible for the development and oversight of strategic research programmes.
Mae Uwch Brif Swyddogion Ymchwil (Gradd 6) yn goruchwylio timau ymchwil lluosog o fewn maes polisi ac yn gyfrifol am ddatblygu a goruchwylio rhaglenni ymchwil strategol.