System Analysis and Design
System prototyping helps the designer in

giving a demo of the software, to the system manager to whom he reports
communicating to the user, quickly, how the system, when developed, will look like and get a feedback.
making the programmers understand how the system will function.
all of the listed here

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System Analysis and Design
Indexed-Sequential organization

means storing records in contiguous blocks according to a key
uses an index for each key type
stores records sequentially but uses an index to locate records
has records placed randomly throughout the file

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