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
to identify a top level function an d then create a hierarchy of lower-level modules and components.
to prepare flow charts after programming has been completed
all of the listed here

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System Analysis and Design
Unit testing is

testing changes made in an existing or a new program
is checking the logic of one or more programs in the candidate system
None of these
running the system with line data by the actual user
making sure that the new programs do in fact process certain transactions according to Specifications

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