System Analysis and Design
System prototyping helps the designer in

communicating to the user, quickly, how the system, when developed, will look like and get a feedback.
all of the listed here
making the programmers understand how the system will function.
giving a demo of the software, to the system manager to whom he reports

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

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.
a decision should be given a name
standardized language must be used consistently.
all of the listed here

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