System Analysis and Design
Sequential or series 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
In a Decision tree

the nodes represent the conditions, with the right wise of tree listing the actions to be taken
the branch, to be followed, depends on the conditions and decisions, to be made
all of the listed here
the root is drawn on the left and is the starting point on the decision sequence

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