There is lot of tools , but , you know, Visio is everywhere.
Why not to use them "professionally" , it means with simulation ?
Here it is:
http://www.global360.com/xres/uploads/resource-center-documents/031710_analystView_DS.pdf
Original article:
http://www.column2.com/2010/03/global-360s-analystview-simulation/
