Use can be made of linked records (that is, survey responses can be analysed in the context of other administrative and survey data that is held about the relevant respondents).
Ar gyfer y dadansoddiad hwn fel rhan o'r broses gysylltu a chyfuno, lle y bo'n bosibl caiff gwybodaeth yr athrawon hynny sydd â mwy nag un rôl (e.e.