System Analysis and Design
System prototyping helps the designer in

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

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System Analysis and Design
Data Definition Language (DDL)

describes how data are structured in the data base
all of the listed here
specifies for the DBMS what is required; the techniques used to process data
determine how data must be structured to produce the user's view

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System Analysis and Design
Rapid prototyping proves the quality of a design by

having a program simulate the real system
None of these
having the system analyst present an overview of the design to users, programmers, and consultants
having a data flow diagram
both (a) and (b)

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