System Analysis and Design
The records in a file or magnetic tape

are meant for backup
cannot be transferred to a disk file
can only be accessed serially
have to be arranged in a key sequence

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System Analysis and Design
The black-box concept:

assumes that the black box is independent
assumes that inputs and outputs will remain stable
is invoked by describing a system in terms of inputs and outputs, leaving the transformation process a black box.
All of these
None of these

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System Analysis and Design
A square symbols

None of these
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

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