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4. Server
EpiSample allows to send out multiple teams with multiple devices to conduct a census and aggregate all of the census data onto one device (such as a team leader device) for sampling, without the need for a laptop, Internet or cables. This is really useful for working on the field where there is no Internet connection and there is no capacity for setting up a local area network for the enumerators devices to transfer the data to a local server.
However, at the end, data consumers expect to have the collected data in a server. Therefore, EpiSample allows to link the App (client) with an ODK Aggregate instance running on a server and send finalized forms (both census and survey forms). Normally, the only instance communicating with the ODK Aggregate service will be the team leader device (where is supposed to be all the data aggregated), although this will depend on the current workflow, as EpiSample allows to link and transfer data to any instance, including the enumerators devices.