German phrase
Welches Vorwissen haben Sie zu ~?
Meaning
What prior knowledge do you have about ___
When to use it
It asks about prior knowledge. This polite, formal wording suits classes and seminars.
Example dialogue
Welches Vorwissen haben Sie zu diesem Thema?
What prior knowledge do you have about this topic?
Ich habe schon Grundkenntnisse in diesem Bereich und einige Artikel gelesen.
I already have basic knowledge in this area and have read several articles.