System Analysis and Design
Top-down programming is

a group of related fields
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 map of the programmer's view of the data

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System Analysis and Design
Sequential or series testing is

testing changes made in an existing or a new program
is checking the logic of one or more programs in the candidate system
running the system with line data by the actual user
making sure that the new programs do in fact process certain transactions according to Specifications

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