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The emergent approach is work from the bottom up, in a manner than allows the system to spread virally along horizontal functional lines. By making the system less restrictive, and easy to use the system is more likely to become the solution of choice for knowledge workers. And as they communicate better, they share information and increase their awareness.
For a system to be emergent, the emphasis needs to be on how quickly the users will adopt the system rather than on its structure. That explains why a hallmark of these Web 2.0 technologies is that they are accessible and less restrictive.
