System Analysis and Design
Unit testing is

is checking the logic of one or more programs in the candidate system
testing changes made in an existing or a new program
None of these
making sure that the new programs do in fact process certain transactions according to Specifications
running the system with line data by the actual user

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System Analysis and Design
Data Definition Language (DDL)

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
describes how data are structured in the data base
all of the listed here

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System Analysis and Design
Cost-Benefit analysis

estimates the hardware and software costs
None of these
All of these
evaluates the tangible and non-tangible factors
compares the cost, with the benefits, of introducing a computer-based system

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