Dear Thomas!
The fantastic property of yEd – from this answer – should be placed in Help to know that this graph editor is able to display graph of any sizes, from several nodes and edges to very complex organizational structures such as projects, transports, communications or social networks.
And that for this user do not need to manually draw the schema, but just set this data in Excel, using of copying, pasting and linking text or numerical values. I'm as a novice user impressed with this powerful graphical tool