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

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

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System Analysis and Design
Top-down programming is

a series or group of components that perform one or more operations of a more complex system
an approach in which the top module is first tested then program modules are added from the highest level to the lowest level
a group of related fields
a map of the programmer's view of the data

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System Analysis and Design
Unit testing is

None of these
testing changes made in an existing or a new program
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
is checking the logic of one or more programs in the candidate system

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