System Analysis and Design
In top down analyis and design

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

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System Analysis and Design
Advantages of Relational Database Management systems are

Flexibility, of relating different logical files
None of these
Security controls can be more easily implemented.
Data independence since it allows the database to grow by adding new attributes and relations.
All of these

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