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

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

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System Analysis and Design
An open rectangle

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

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System Analysis and Design
Rapid prototyping proves the quality of a design by

having a data flow diagram
having the system analyst present an overview of the design to users, programmers, and consultants
having a program simulate the real system
both (a) and (b)
None of these

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