System Analysis and Design
The structure chart is:

a statement of information-processing requirements
a hierarchical partitioning of the program
a document of what has to be accomplished
all of the listed here

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System Analysis and Design
An open rectangle

defines a source or destination of system data
identifies data flow
is a data store-data at rest, or a temporary repository of data
represents a process that transforms incoming data flow(s) into outgoing data flows
None of these

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