System Analysis and Design
Sequential or series testing is

testing changes made in an existing or a new program
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
is checking the logic of one or more programs in the candidate system

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System Analysis and Design
A couple:

None of these
None of these
means that the upper module has the capability of calling the lower module
is a data item that moves from one module to another
is represented by a line joining two modules

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