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Tracker and integration with an aggregate level national system

To: DHIS 2 Users list <dhis2-users@xxxxxxxxxxxxxxxxxxx>
From: Edward Robinson <erobinson@xxxxxxxxxxxxxxxxxx>
Date: Wed, 18 Oct 2017 13:56:40 +0000
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Thread-topic: Tracker and integration with an aggregate level national system

I have a few questions regarding setting up multiple tracker programs when an existing national system is implemented.
What is the general consensus with setting up tracker programs in a national level environment - is it preferable to set them up on separate instances?
What about aggregation of data - is it relatively straight forward to aggregate the data from the tracker instance to the national aggregated instance?
Would we need to configure the process ourselves as an export/import or is this something that can be achieved within DHIS2 automatically?

Thanks!