System Analysis and Design
A data flow diagram is

mainly used at the systems specification stage.
All of these
None of these
the modern version of flowchart
the primary output of the systems design phase

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System Analysis and Design
Positive testing is

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

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