System Analysis and Design
An open rectangle

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

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System Analysis and Design
The rule(s) to follow in constructing decision tables is (are):

a decision should be given a name
the logic of the table is independent of the sequence in which conditions rules are written, but the action takes place in the order is which the events occur.
standardized language must be used consistently.
all of the listed here

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