System Analysis and Design
The approach used in top-down analysis and design is

to identify the top level functions by combining many smaller components into a single entity
all of the listed here
to prepare flow charts after programming has been completed
to identify a top level function an d then create a hierarchy of lower-level modules and components.

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

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