System Analysis and Design
Sequential or series 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

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System Analysis and Design
Direct-access organization

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

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