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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System Analysis and Design
A square symbols

defines a source or destination of system data
None of these
represents a process that transforms incoming data flow(s) into outgoing data flows
is a data store-data at rest, or a temporary repository of data
identifies data flow

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