System Analysis and Design
System prototyping helps the designer in

all of the listed here
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.

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System Analysis and Design
Sequential organization

Stores records sequentially but uses an index to locate records
None of these
has records placed randomly throughout the file
uses an index for each key type
means storing records in contiguous blocks according to a key.

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