System Analysis and Design
The four icons used in building Data Flow Diagram are

Flow, Process, Source, Store
None of these
Flow, Source, Store, Process
Flow, Process, Source/Destination, Store
Source, Process, Destination, Store

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

all of the listed here
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.

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System Analysis and Design
Top-down programming is

an approach in which the top module is first tested then program modules are added from the highest level to the lowest level
a series or group of components that perform one or more operations of a more complex system
a group of related fields
a map of the programmer's view of the data

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