Some answers given are reflected in the wording of subsequent questions or checks (for example the names of children given are mentioned in questions on children’s schools).
Mae’r rhan fwyaf o’r dystiolaeth wedi’i seilio ar rywfaint o gyfarwyddyd a arweinir gan yr athro, wedi’i gynnal mewn grŵp bach neu leoliad tebyg i ddosbarth.