System Analysis and Design
Sequential or series testing is

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
running the system with line data by the actual user
testing changes made in an existing or a new program

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System Analysis and Design
An audit trial is

All of these
None of these
designed to permit tracing of any input record or process performed on a system, back toits original sources
post-auditing the system after its implementation
test data used by the system auditor

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