System Analysis and Design
System prototyping helps the designer in

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

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System Analysis and Design
Direct-access organization

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

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