I recently re-read 2001 and there was a forward by Clarke that explained something I hadn't known before - the screenplay and the book were developed simultaneo

I recently re-read 2001 and there was a forward by Clarke that explained something I hadn't known before - the screenplay and the book were developed simultaneously, in a joint collaboration between Kubrick and Clarke. Kubrick wanted Clarke to come up with an epic space story and put it on the screen, but didn't want to burden Clarke with having to write a screenplay. So I don't think you can really call the book a "novelization" because both worked on it.