System Analysis and Design
Top-down programming is

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

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System Analysis and Design
Indexed-Sequential organization

has records placed randomly throughout the file
uses an index for each key type
stores records sequentially but uses an index to locate records
means storing records in contiguous blocks according to a key

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