System Analysis and Design
A square symbols

defines a source or destination of system data
None of these
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

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System Analysis and Design
The approach used in top-down analysis and design is

all of the listed here
to identify the top level functions by combining many smaller components into a single entity
to prepare flow charts after programming has been completed
to identify a top level function an d then create a hierarchy of lower-level modules and components.

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