System Analysis and Design
The black box concept is based on the assumption(s) that;

the relationship between the inputs and output is stable
None of these
All of these
black boxes are dependent or environments
the suprasystem is stable

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System Analysis and Design
Unit testing is

making sure that the new programs do in fact process certain transactions according to Specifications
running the system with line data by the actual user
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

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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.
all of the listed here
to prepare flow charts after programming has been completed

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