System Analysis and Design
Top-down programming is

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

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System Analysis and Design
Data Definition Language (DDL)

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

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System Analysis and Design
Unit testing is

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

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