In Alpana, data preparation happens in Data Sources.
Each Data Source prepares a query to the original data to be presented inside Widgets.
Data is fetched through the Alpana Connections, see Course Connecting to Data.
Each Widget displays data from a single Data Source (but a Data Source can be re-used in any number of Widgets).
Alpana Designer provides a graphical editor that allows to make this data preparation using simple mouse interaction.