I saw this article on a process visualization tool called Spaghetti map.  The process is relatively intuitive and is a systematic way to visualize the physical space in which processes occur.  We have used it at Ximedica on processes that end up literally looking like a bunch of tangled spaghetti!

http://www.sixsigmaiq.com/columnarticle.cfm?columnid=10&externalid=1874&WT.mc_id=EM4780M&WT.dcsvid=79568473