Not my best but I'm not good with diagramming. [I use Dia - a
   free one for Windows - really nice and easy] - I just notice
   that it gives an authoritative flair to a concept. Graphs and
   statistics and "Scientists say" does too but if I added some
   arrows, it'd be locked down as solid gold bona-fide
   fact-a-mundo, so I have to be careful when I make them tongue
   emoticon [I'm easily convinced by a good process flowchart or a
   'systems overview' tongue emoticon ]