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Asynchronous tools
Asynchronous tools enable communication and collaboration over a period of time through a "different time-different place" mode. These tools allow people to connect together at each person's own convenience and own schedule. Asynchronous tools are useful for sustaining dialogue and collaboration over a period of time and providing people with resources and information that are instantly accessible, day or night.
http://www.asaecenter.org/PublicationsResources/articledetail.cfm?ItemNumber=13572