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

all of the listed here
to prepare flow charts after programming has been completed
to identify the top level functions by combining many smaller components into a single entity
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 a Decision tree

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the branch, to be followed, depends on the conditions and decisions, to be made
the nodes represent the conditions, with the right wise of tree listing the actions to be taken
the root is drawn on the left and is the starting point on the decision sequence

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