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
making sure that the new programs do in fact process certain transactions according to Specifications
None of these
running the system with line data by the actual user

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System Analysis and Design
In the system concepts, term Integration

implies structure and order
refers to the manner in which each component functions with other components of the system.
refers to the holism of systems
means that parts of the computer system depend on one another

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