System Analysis and Design
In the system concepts, term Integration

refers to the holism of systems
means that parts of the computer system depend on one another
refers to the manner in which each component functions with other components of the system.
implies structure and order

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System Analysis and Design
A square symbols

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

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