<p>The WUSTL supplement is done offline (outside of common app), and after I completed it, I couldn't save it, and I wasn't going to send it that day so I had to lose all the information. Do you basically have to fill it out right before you submit the application?</p>
<p>No just send it whenever you finish it. You won't have to pay an application fee until you submit the actual application.</p>
<p>washu's supplement is more like a pre-application thing.. just fill it out and send it in, really.. having no essay on it is great (well, besides the common app essay)</p>