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Dieter, I have always assumed that width refers to the "branching factor". So in the position you are giving, it would be 6 for a complete beginner (who has to try every single move), 2 for a more experienced one (who will read out the variations starting with either of the two center points), and one for a dan player (who just sees the correct move blinking).
I could easily be wrong, of course. I guess I have seen this notion more in a computer search algorithm context (where I am pretty sure that "width" of a search has the meaning I am trying to explain here).
Arend
In the meantime I have renamed the pages to reading width and such. Yes, it is the branching factor, but branching does not restrict to the first move. So I think the real width is the full number of variations.
If you branch into 4 variations at move 2, the reading is more difficult than branching into 2 a move 1. Yet, according to your proposal, the first would have width 1 and the second width 2.