The utility lies just where CavGuy said it does in his original post...to provoke discussion. It's not intended to be all-encompassing (at least I would HOPE that one PowerPoint slide isn't intended to be that way....), but rather to get folks talking and (hopefully) thinking about what the slide suggests and doesn't suggest. He didn't put it forward as being definitive in any way, and we should keep that in mind when we discuss it.
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