System Analysis and Design
A common reason for changing an information system is

new requirements
problems in the existing system
None of these
new technology
All of these

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

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

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