System Analysis and Design
In top down analyis and design

each succeeding phase is as detailed as the phase before it.
each succeeding phase is more detailed than the phase before it
each succeeding phase is less detailed than the phase before it
all of the listed here

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System Analysis and Design
Direct-access organization

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

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