System Analysis and Design
Difference between Decision - Tables and Decision Trees is (are):

value to end user
None of these
All of these
one shows the logic while other shows the process
form of representation

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System Analysis and Design
Positive testing is

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
making sure that the new programs do in fact process certain transactions according to Specifications

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System Analysis and Design
The black-box concept:

is invoked by describing a system in terms of inputs and outputs, leaving the transformation process a black box.
assumes that inputs and outputs will remain stable
assumes that the black box is independent
None of these
All of these

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