System Analysis and Design
A Decision table

documents rules, that select one or more actions, based on one or more conditions, from a set of possible conditions.
represents the information flow
gets an accurate picture of the system
shows the decision paths

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System Analysis and Design
A square symbols

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

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