You must rememberthat English is not entirely phonetic, so just because a student knows a word doesn't mean that they can understand it when it is said to them at native speed or pronounce it correctly.
You may remember Lord Nolan's principles of public life and the two words or rather the one word out of that "integrity" seem to be quite crucial here.
Used to be (remember those days?) that the high quality of some self-published books (and even proposals pre-word-processing) was a great way to quickly determine the commitment of the author and often even was a harbinger of the quality of the prose itself.