I have seen many a process diagram, one of the things that I have come to realize over the course of the years is just how different people model their processes. One of the things that I have noticed to be common across some of the most unreadable process models is the fact that they are a lot less structured than they should be. Boxes are thrown anywhere, lines overlap each other, there are 800 different elements on the page and the general feel of the diagram is that the process before you is the most complex task anyone could undertake.