The USC Scripter is an award that is handed out for both the source material and the screenplay. It is judged upon by industry professionals, scholars, journalists and critics (names after the jump) and has a decent track record with Oscar and the WGA in the adapted categories. Their nominations will be announced tomorrow morning at 5am.
The Scripter acknowledges the source material in addition to the screenplay but they expanded their rules so it is no longer just a book but can be a magazine article, play or graphic novel.
As you can see by the below chart, to win the Oscar in adapted it helps to at least be nominated by the WGA and the Scripter. In the Scripter’s history, no Oscar winning adapted screenplay has ever won without one or the other or both.