System Analysis and Design
To reconstruct a system, which of the following key element(s) must be considered :

control and processors.
outputs and inputs
all of the listed here
feedback and environment

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System Analysis and Design
In a Decision tree

all of the listed here
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
the root is drawn on the left and is the starting point on the decision sequence

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