System Analysis and Design
Positive testing is

making sure that the new programs do in fact process certain transactions according to Specifications
testing changes made in an existing or a new program
is checking the logic of one or more programs in the candidate system
running the system with line data by the actual user

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System Analysis and Design
An audit trial is

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

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