System Analysis and Design
An open rectangle

defines a source or destination of system data
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
identifies data flow
None of these

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System Analysis and Design
A menu-driven system

None of these
increases the operator's work
is required only for on-line systems
can be used only by computer professionals
presents options and allows the user to make selections

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