In order to define the idea of a DAC consider what we mean by a community. A community is typically a collection of people that are bound by some common interest. For example, a village community is a collection of villages and the people there who would be interested in improving their agricultural production. Another example, a group of photographers who may be interested in photo products such as cameras, digital processing software, their prices and quality etc.
We can have wiki pages, sharepoint sites for such communities where the members and interested parties posts notes. But these posts are static.
Think about such pages which are active – they can automatically summarize information, send out notifications, allow members to register, analyze products and qualities over time etc.
One example of a DAC we are currently working on in the ECO project is the Kapgari village community. The common goal is to improve agricultural production, improve income, reduce cost and consumptions, improve livestock, tools, technology etc for better socio-economic life.