added data flow related to issue #22

data-collection/009-data-flow.md

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+# Data flow from Data Collection to Central Datastore
+
+**Aim**
+To establish the flow of data from [the data collection tool](./006-odk.md) we identified to the central datastore that has the data model we proposed [here](../information-mapping/001-data-model.md).
+
+![data model](../information-mapping/assets/data-model.png)
+
+**Suggested procedure**
+1. While building a form for data collection on ODKBuild, specificy the entity for which the data is to be collected.
+2. Add input fields for the attributes required for an entity. Eg: When collecting data related to a school, add input fields for school name, address, zone, number of teachers and students etc.
+3. Mark all these fields as required.
+4. After received submissions, extract school level information from them and transfer the information to central datastore.
+5. When data for all the entities reaches the datastore, further analysis and mapping can be done.