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An alternative structured design strategy for developing structure charts is called transaction analysis.
Transaction analysis is the examination of the DFD to identify processes that represent transaction centers.
A transaction center is a process that does not do actual transformation upon the incoming data (data flow); rather, it serves to route the data to two or more processes.
You can think of a transaction center as a traffic cop that directs traffic flow.
Such processes are usually easy to recognize on a DFD, because they usually appear as a process containing a single incoming data flow to two or more other processes.
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