System Analysis and Design
The rule(s) to follow in constructing decision tables is (are):

the logic of the table is independent of the sequence in which conditions rules are written, but the action takes place in the order is which the events occur.
all of the listed here
a decision should be given a name
standardized language must be used consistently.

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System Analysis and Design
Positive testing is

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

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