System Analysis and Design
A system analyst designs a new system by

None of these
developing the system as a large, single unit
adopting a developed system to the present environment
propose alternatives to the current system
identifying sub systems and the interfaces between sub systems

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System Analysis and Design
In a Decision tree

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

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