Reviewing Your Evidence
Once you've got a working draft of your argument, you want to make sure that you have adequate support for all your claims. The best way to do this is to go through your argument, sentence by sentence, circling all the claims you have made. List them on a sheet of paper and ask whether it is a claim with which any member of your audience might disagree.
Under each claim, list what evidence you offer in its support. If none is offered, perhaps further research is in order: If only one piece is offered, judge whether it is authoritative enough to support the claim and whether it should be included at all.