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How exactly does the software map the DFD into the SER?

dfd map Software
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How exactly does the software map the DFD into the SER?

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All the processes/activities in DFD are converted into “contexts” in SER. All the data flows between process->process and process->external entity are converted into “subjects”. All data stores become “subjects”. The data flows to data stores are not modeled as separate subjects but form part of the data store subject.

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