System Analysis and Design
An open rectangle

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

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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.
all of the listed here
standardized language must be used consistently.

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