System Analysis and Design
Sequential or series testing is

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

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System Analysis and Design
Direct-access organization

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

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