Data (like Year-to-date totals)that come from a data store and are used in a process (like 'Calculate YTD Totals')and then the updated amounts are written back to the data store - can be drawn on a DFD model as a two-headed arrow.

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In a Data Flow Diagram (DFD), data flow is represented by a single-headed arrow, indicating the direction of data movement between processes, data stores, and external entities.

Data (Like Year-To-Date Totals)that Come from a Data Store and Are