I've re-read Anthony's 8 challenges several times and keep wondering in which of those challenges *relational proximity* or *virtual distance* belongs as a continuous management challenge.

If we accept that learning is the work, that it's social, and that much knowledge work is carried out in conditions that are social-and-seeking-effective-collaboration, then I think that in purposeful networks the proximity/distance concept will always be at play in/with the relationships and dynamics of the collaborative work.