Why do Communities of Practice fail?

I've been writing a series of articles on the three maturity levels we see at companies using social technologies. The three levels are: Reaching people - People primarily use the platform to push information to others. The biggest benefit is the increased reach compared to other channels. Leveraging the network* - People understand the potential of the network and use it to their advantage to tap into the vaste intellectual resource made available through that network. Faster and more agile - People adopt concepts such as Working out loud or Working in the narrative. The collective awareness increases as does the alignment in the organisation. The rate of decision making increases and the c