I am trying to create a chart like this that shows item 1 effects items 2 and 4 type chart. I didn't really know where to post this so I thought mathematics would be the right place because of the amount of charts and graphs we deal with. If anyone could tell me the name of this type of chart I would appreciate it. Extra Kudos if you could tell me a program I can quickly create one in. I have to do this for over 20 items.