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

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

gets an accurate picture of the system
shows the decision paths
represents the information flow
documents rules, that select one or more actions, based on one or more conditions, from a set of possible conditions.

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