validity of will

What specific question is asked an executor in regards to the validy of the will at a probate hearing?

The executor is given the task of proving that the document offered is actually the will, that the deceased signed it, that it was witnessed by 2 or 3 witnesses, that the witnesses saw the deceased sign it and signed their own names at her request, that the deceased seemed to be of sound mind and memory, and that she did sign the document voluntarily, free from duress, as far as they can tell.